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: Excuse me. I need to get to Cambridge today. ,M: Would you like to go by train or by bus? ,F: I am not sure. Which one is better? ,M: The bus is cheaper, but also slower. It will take about 2 and half hours. ,F: And how long does the train take? ,M: If you take the fast train, it will take about 50 minutes. ,F: Where do I catch the train? ,M: The trains for Cambridge leave from Kings Cross Station. They run every half hour. Most trains to Cambridge go from platform 9. ,F: How do I get to Kings Cross Station? ,M: The best way is to take an underground train directly to Kings Cross Station. The underground station is just round the corner from here. ,F: Can you show me on the map? ,M: Just turn right when you leave, and then turn right again at the first crossroads. The entrance to the underground station is about 50 meters further on.
(A) F: 30 meters? That's very close. (B) F: I am really sorry, I did not catch that. Would you slow down, please? (C) F: So it's only 50 meters from here to the exit. (D) F: 50 meters? I think I can walk there.
D