It is appropriate for a research paper because it is not opinion based or based in fantasy, it is a real thing you can do research on.
I believe your answer would be c if talking about historic fiction !!
Answer:
To explain Thoreau's view that we have a responsibility to act
there you go, hope it will help
https://www.bartleby.com/essay/Use-Of-Allegory-In-George-Orwells-Animal-FJYXPA3VELV
