A、  B、  C、  B在回答以Who开头的问题时，要有表示人名或具体职位等的词。(C)是完全不相干的答案，(A)中的she指代不清，所以(B)“市场总监”是最恰当的。

Where should I put these boxes?
(A)Beside the other ones.
(B)No, they’re a little heavy.
(C)They’re unloading them now.

Who will be hosting the awards banquet?
(A)She does it every year.
(B)The director of marketing.
(C)I don’t expect to get one.