F: What's the problem? Don't you have your apartment key? ,M: It's a good thing, I leave a spare key with my neighbor. I'm going to stop by and ask him for it. So I can get in and get my books.
(A) F: Your book is at your neighbor's. (B) F: Your book is at your apartment. (C) F: You leave a spare key in your apartment and you will get your book from your neighbor. (D) F: I am really sorry, I did not catch that. Would you slow down, please?
B