If this is the Diary of Anne Frank, which I believe it is, my guess would be that she is either being critical or she genuinely wants to help them, A or B. It's been so long since I read this, but from what I can remember of Anne, she seems like the type to genuinely want to help them, so I'd guess B.
MLA in-text citation style uses the author's last name and the page number from which the quote or paraphrase is taken, for example: (Fitzpatrick 23).
He was so scared probably because he didn't trust them.
