You will be given a definition of a task first, then some input of the task.
In this task you are given a small conversation between two persons and 4 options on how the conversation should continue. Your job is to choose the most reasonable option. The conversation and the options are separated by a newline character. Each dialogue in the conversation are separated by a comma. F and M indicate female and male, respectively.

F: How was your trip? ,M: Berlin was great. David really likes living there. We had a good time hanging out. The 5 days went by fast. ,F: How long has David been there? ,M: 6 months. He seems to have gotten really comfortable there. He knew where all the best restaurants, cafes and nightclubs were, and the people there seemed really relaxed. It was a nice change from life in London.
(A) F: I'm sorry, I don't understand. Could you say it again? (B) F: He seems to have gotten really uncomfortable there? Oh, David is your former co-worker, and you must be sad to hear it. (C) F: Yeah, it was a nice change from life in London. David is your former co-worker, I think you must miss him. (D) F: Yeah, he didn't know where all the best restaurants were. David is my boyfriend and I am worried about him.
Output:
C