Prose Definition: Prose is a form of language that has no formal metrical structure. It applies a natural flow of speech, and ordinary grammatical structure rather than rhythmic structure, such as in the case of traditional poetry.
Hope this helps. ;)
My best guess is A, but I’m not positive.
I believe that the answer is C - remind readers of the relevance of the topic. From what I have learned you don't directly restate your thesis, you summarize your main points.