F: What can I do for you? ,M: I'd like to return some books. ,F: I'll take them. ,M: Thanks. Here are all of them.
(A) F: You are welcome. Which page has the teacher asked us to turn to? (B) F: I am really sorry, I did not catch that. Would you slow down, please? (C) F: All done. Here is your library card. (D) F: You are welcome. Please go to the cashier of the bookstore to get your refund.
C