Task: Dialogue Generation
Input (English): F: You look very anxious this evening. Is there anything wrong? ,M: I'm worried about my 15 year old niece Helen. ,F: What's worrying you. ,M: I've seen a big change in her. She used to be very outgoing and sociable, but now she is having problems with other children at school. Now, she is totally someone else. ,F: Really? ,M: Yes. Now, she is quiet and doesn't want to talk to anyone else. Her teacher said things are going backward in her study.
(A) F: I see. You think that your daughter Helen is having problems with her teachers, right? (B) F: Excuse me, could you repeat the question? (C) F: You mean that Helen has changed a lot in terms of character. How does that happen? (D) F: Though you worry about Helen's relationship with parents, she's doing well in study anyway.
Output (English): C