A、  B、  C、  B询问收取费用(How much)的问题，涉及具体金额“200美元”的(B)选项应为正确答案。问题中的charging(收取)和(C)选项中的charge(充电)发音相似容易混淆。

How many of those black markers do we have left?
(A) There are only two, I think.
(B) I also have a blue one.
(C) He said to check on the right side.

How much is the lawyer charging us?
(A) No, he went to business school.
(B) Two hundred dollars an hour.
(C) It takes an hour to charge the battery.