Given the task definition and input, reply with output. 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: Good afternoon, do you know where the subway station is? ,M: It's down the street about 2 blocks away. ,F: I've never been to this city before, so I'm not familiar with the city. Can I find it easily? ,M: I think so. Just walk down the street for about 5 minutes and you'll see a sign for it right in front of a post office. Keep walking for about 10 minutes and you'll be at the subway station. So, are you here to visit friends or for business? ,F: Actually, I'm with 2 friends to go sightseeing. We got separated while we were shopping in the mall, so they went to the train station and are now waiting for me there.
(A) M: You need to walk a total of five minutes. (B) M: Ten minutes' walk in all. (C) M: I'm sorry, I didn't catch that. Would you mind speaking more slowly? (D) M: You have to walk 15 minutes to get the train station.
C