Task: Dialogue Generation
Input (English): M: I'm not satisfied with it. ,F: Why not? What's wrong with it? ,M: Sometimes it goes fast and sometimes it goes slow, and the alarm doesn't work either. ,F: Would you like another one? ,M: No, can I have my money back? ,F: Emm, have you got a receipt? ,M: A receipt? ,F: Yes, I must see your receipt. You can't have your money back without a receipt. ,M: Though I'm not certain, but I think I've lost it.
(A) F: Thanks for telling me where I can get an alarm clock. I'll take a taxi on the street. (B) F: So you want a new one instead of getting your money back, right? (C) F: Sorry. We can't return your money if you don't get the receipt. (D) F: Excuse me, could you repeat the question?
Output (English): C