The concept of demand is best described as:
a. the total satisfaction that consuming a good provides people at different prices.

b. the quantity of a good or a service that people will offer for sale at different possible prices.

c. the additional satisfaction derived from a quantity of goods and services obtained when income increases.

d. the quantity of a good or a service that people are willing and able to purchase at different possible prices.

e. the quantity of a good or service that consumers will substitute when the price of a good changes.

The correct answer is letter "D": the quantity of a good or a service that people are willing and able to purchase at different possible prices

Explanation:

Demand is the economic term for the consumer's combined wishes and desires on a specific good or service for a given period. Generally speaking, ceteris paribus, as demand increases for a good, so does the price of that good. People will make purchases from different sellers depending on the price they are willing to pay.

the correct answer option is b. a single paragraph.

explanation:

when you are thinking about paragraph​ topics, you should always choose a subject that can be adequately addressed in a single paragraph.

a paragraph is a piece of writing consisting of a few sentences that deal with a single theme. it has only a single idea that the paragraph revolves around and talks about.

so a paragraph topic must be chosen wisely where a single idea can be communicated in a single paragraph.