I wish there were any answer choices if there were any but the answer is - to define the purpose of the essay and show whos point of view it is.
The answer is C. This is because but is being used as a conjunction separating independent clauses in the other answers. You can remove but from A, B, and D, and you are left with 2 simple sentences.
I hope this helps!!!
Answer: The anwser is D: supporting detail. Your welcome
Answer: I don’t think so....
Explanation: hope this helps!
The last one, plant and animals food sources both contain iron, but the iron in animal foods is more accessible to the body :)