It’s purpose is to B inform. Because you are trying to inform others about your side of the problem.
Answer: try using perdue owl. they are the #1 most trusted site for formatting and tips.
Explanation:
https://owl.purdue.edu/owl/purdue_owl.html
I’m not completely sure if this is correct but i’m going with D
The best answer would be C) Reference section because if I were to walk in a library (which I have) I don't see encyclopedias in the fiction section cuz encyclopedias are REAL not fake, and an encyclopedia is NOT a biography book, and its not fiction either so its in the reference section.