Definition: 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.
Input: M: Hello. This is the China Telephone Company. What can I do for you? ,F: Is this the Complaints Department? ,M: Yes, it is. ,F: I want to complain about the bill I received this month. I don't think I've made that many phone calls. Have their rates gone up? There must be a mistake in your billing. ,M: Alright Madam, tell me your phone number and I'll check it for you. ,F: My number is 63513516. ,M: Thank you. Please hold on for a moment. ,F: Alright. ,M: Hello? ,F: Yes, I'm still here. ,M: Well, there doesn't seem to be any problems with your account. The billing is accurate. You must have overlooked the international call you made to Europe. ,F: Let me see. Right. I'm sorry, it's my mistake. But it is still very expensive. ,M: Well, why don't you apply for the international dial service? It's free of charge. ,F: Can I do that? ,M: Sure. You can. The rates are cheaper as you do without assistance from the operator. ,F: I see. Well, thank you very much and I'm sorry for bothering you. ,M: It's no bother at all. That's what we're here for. Thanks for calling.
(A) F: Why do you refuse to check the bill? I am very angry. (B) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) F: Thank you very much, manager of China Mobile Company. (D) F: Though you are patient, but what you said is not helpful at all.

B