How was rockefeller able to build his monopoly across the oil industry?
a. he found newer and cheaper ways to refine oil, increasing his profits.
b he confined his business to ohio so he could buy all the refineries there.
c he bought up oil refineries, cut costs, and reinvested his profits in other refineries.
d he began to sell kerosene as well as oil, expanding his market.

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

the topic i chose to write about was " why scuba diving is so popular". the topic is suitable for the audience because it is the easiest to develop and explain, it can be explained in a simpler more conversational manner, it does not require the use of too many technical words, and the final reason for selecting this topic is that it is the one most people can relate to, you might not know too much about scuba diving, but you could probably agree that it is very popular. the purpose of the writing about this topic is to convince more people about the benefits both for the body and the mind that   scuba diving can have on a person. it can you keep fit since it requires a lot of energy when swimming underwater; it also you relax because you forget about the world when you are underwater being mesmerized by the underwater world. i would write this paper in the summer, a perfect time to give scuba diving a try if a person has not done it yet.

the real answer is b

president of india

the oath of office for the president of india is as follows:

i, (name), do swear in the name of god (or solemnly affirm) that i will faithfully execute the office of president (or discharge the functions of the president) of india, and will to the best of my ability preserve, protect and defend the constitution and the law, and that i will devote myself to the service and well-being of the people of republic of india.

— article 60, constitution of india

मैं, अमुक ईश्वर की शपथ लेता हूँ (सत्य निष्ठा से प्रतिज्ञाण करता हूँ) कि मैं श्रद्धापूर्वक भारत के राष्ट्रपति के पद का कार्यपालन (अथवा राष्ट्रपति के कृत्यों का निर्वहन) करूँगा तथा अपनी पूरी योग्यता से संविधान और विधि का परिरक्षण, संरक्षण और प्रतिरक्षण करूँगा और मैं भारत की जनता की सेवा और कल्याण में निरत रहूँगा।

— अनुच्‍छेद 60, भारत का संविधान

vice-president of india

the oath of office for the vice-president of india is as follows:

i, (name), do swear in the name of god (or solemnly affirm) that i will bear true faith and allegiance to the constitution of india as by law established, and that i will faithfully discharge the duty upon which i am about to enter.

— article 69, constitution of india

मैं, (अमुक) ईश्वर की शपथ लेता हूं(सत्यनिष्ठा से प्रतिज्ञान करता हूं) कि मैं विधि द्वारा स्थापित भारत के संविधान के प्रति सच्ची श्रद्धा और निष्ठा रखूंगा तथा जिस पद को मैं ग्रहण करने वाला हूं उसके कर्तव्यों का श्रद्धापूर्वक निर्वहन करूँगा।

— अनुच्‍छेद 60, भारत का संविधान

union council of ministers of india

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the oath of office for prime minister and other members of the union council of ministers:

the oath of office is as follows:

i, (name), do swear in the name of god (or, solemnly affirm) that i will bear true faith and allegiance to the constitution of india as by law established, that i will uphold the sovereignty and integrity of india, that i will faithfully and conscientiously discharge my duties as a minister for the union and that i will do right to all manner of people in accordance with the constitution and the law, without fear or favour, affection or ill-will.

— schedule iii, constitution of india

मैं, (अमुक), ईश्वर की शपथ लेता हूँ/सत्यनिष्ठा से प्रतिज्ञान करता हूँ कि मैं विधि द्वारा स्थापित भारत के संविधान के प्रति सच्ची श्रद्धा और निष्ठा रखूँगा, मैं भारत की प्रभुता और अखंडता अक्षुण्ण रखूँगा, मैं संघ के प्रधानमंत्री/मंत्री के रूप में अपने कर्तव्यों का श्रद्धापूर्वक और शुद्ध अंतःकरण से निर्वहन करूँगा तथा मैं भय या पक्षपात, अनुराग या द्वेष के बिना, सभी प्रकार के लोगों के प्रति संविधान और विधि के अनुसार न्याय करूँगा।

— तीसरी अनुसूची, भारत का संविधान

the oath of secrecy is as follows:

i, (name), do swear in the name of god (or, solemnly affirm) that i will not directly or indirectly communicate or reveal to any person or persons any matter which shall be brought under my consideration or shall become known to me as a minister for the union except as may be required for the due discharge of my duties as such minister.

— schedule iii, constitution of india

मैं, (अमुक), ईश्वर की शपथ लेता हूँ/सत्यनिष्ठा से प्रतिज्ञान करता हूँ कि जो विषय संघ के मंत्री के रूप में मेरे विचार के लिए लाया जाएगा अथवा मुझे ज्ञात होगा उसे किसी व्यक्ति या व्यक्तियों को, तब के सिवाय जबकि ऐसे मंत्री के रूप में अपने कर्तव्यों के सम्यक्‌ निर्वहन के लिए ऐसा करना अपेक्षित हो, मैं प्रत्यक्ष अथवा अप्रत्यक्ष रूप से संसूचित या प्रकट नहीं करूँगा।

— तीसरी अनुसूची, भारत का संविधान

chief justice of the supreme court or high court

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the oath of office for chief justice of supreme court or high court is as follows:

i, (name), having been appointed chief justice (or a judge) of the supreme court of india, do swear in the name of god (or affirm) that i will bear true faith and allegiance to the constitution of india as by law established, that i will uphold the sovereignty and integrity of india, that i will duly and faithfully and to the best of my ability, knowledge and judgment perform the duties of my office without fear or favour, affection or ill-will and that i will uphold the constitution and the laws.

— schedule iii, constitution of india

मैं, (अमुक), जो भारत के उच्चतम न्यायालय का मुख्य न्यायमूर्ति (या न्यायाधीश) (या भारत का नियंत्रक-महालेखापरीक्षक) नियुक्त हुआ हूँ, ईश्वर की शपथ लेता हूँ/सत्यनिष्ठा से प्रतिज्ञान करता हूँ कि मैं विधि द्वारा स्थापित भारत के संविधान के प्रति सच्ची श्रद्धा और निष्ठा रखूँगा, मैं भारत की प्रभुता और अखंडता अक्षुण्ण रखूँगा तथा मैं सम्यक्‌ प्रकार से और श्रद्धापूर्वक तथा अपनी पूरी योग्यता, ज्ञान और विवेक से अपने पद के कर्तव्यों का भय या पक्षपात, अनुराग या द्वेष के बिना पालन करूँगा तथा मैं संविधान और विधियों की मर्यादा बनाए रखूँगा।