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.

M: Good afternoon, madam. How can I help you? ,F: Well, I am a little bit out of shape. I think I should get some exercise to keep fit. What kind of service do you offer? ,M: First of all, we'll work out a plan according to your physical conditions and your personal needs. ,F: How can you get that done? ,M: Well, we give each of our customers a qualified personal trainer. The trainer will give you a fitness assessment and then come up with a plan. ,F: What else? ,M: Since everyone is different, your personal trainer will help you find out all the exercise equipment that is suitable for your fitness level. Then you'll be taught all the necessary techniques. ,F: Sounds pretty good. How much do you charge? ,M: That depends. We offer membership for one month, half a year and one year. ,F: Perhaps, one month. I'll just have a try at first. ,M: Wise decision. That is 400 yuan. You'll find it's totally worth it.
(A) F: I'm sorry, I didn't catch that. Would you mind speaking more slowly? (B) F: Yeah, I think 400 yuan for a month is worth considering. (C) F: Let's buy the membership, darling. Only 400 yuan a month. (D) F: This is a good price! 800 yuan for a whole year's membership.
Output:
B