I think truism would be best because my teacher always said people your sending your big test paper to do not care about just the essay so don't talk about yourself to much only if it's opinion say I'm my opinion but not about your life
A. is the most sensible answer tbh, the librarian is inside a library she/he wouldn't really pay attention to kids. Books on gender roles may be in there a bit but not completely since it won't really talk about what you're trying to search for. Articles on phycology definitely isn't going to helped learn about children on the playground.
*Menelaus* would be your correct answer
