A、  B、  C、  C所给出的问题是一个询问对方意见的疑问句，Shall we…?的含义是“我们做……怎么样?”因此选项(C)表示同意的回答，是符合语境的正确答案。选项(A)是利用Finnish和finish同音异义而故意

I wonder how long it’ll take to drive to the conference center from the airport.
(A)It depends on traffic.
(B)Because it’s close to the hotel.
(C)The flight’s just under two hours.

Shall we aim to finish by four-thirty?
(A)Are they Finnish? I thought they were Swedish.
(B)There’ll be six of us.
(C)That sounds good.