The correct answer is C. Refrain. hope this helps :)
Well a theme is the central message and lesson, so the way I learned is to come up with possible morals of the novel, then find evidence for each one, see which one is best supported, and use that one. If you think that will take too long, just find possible morals, then keep ruling them out until the one that makes the most sense is left, then find evidence for only that one.
Hope I helped you.
D. because instead of saying Stephanie they said youth council president <span />
I believe it's B. Second person pronoun since it seems to be a secondary character referring to another character.