Which sentence uses punctuation correctly?

a. there are thousands of species of colorful native wildflowers in
eastern north america, and only eleven species have orange
flowers.
b. there are thousands of species of colorful native wildflowers in
eastern north america, only eleven species have orange flowers.
c. there are thousands of species of colorful native wildflowers in
eastern north america only eleven species have orange flowers.
d. there are thousands of species of colorful native wildflowers in
eastern north america; only eleven species have orange flowers.

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.

based on the biblical principle philippians 4: 13 "i can do everything through christ who strengthens me." i agree that it is through him that we are given the strength to cope with every situation.

and based on the biblical principle proverbs 16: 32 "better to get angry slowly than to be a hero. better to be even-tempered than to capture a city."   i agree with the author of the passage to the extent that the nobility of heart demonstrates the strength of a person. those who are contemptuous, get angry easily and show their anger toward others are really weak, but those who are noble and make sure to not hurt other people and their feelings are strong people.