A、  B、  C、  C(A)不符合对话场景，直接排除；(B)是过去时态，而问句指的事尚未发生的事情，故排除。

In which way do you sell, by wholesale or by retail?
(A) Both wholesale and retail are welcome.
(B) I want to buy a set of equipment.
(C) Well, this way please.

Should I have someone pick up the file or will you send it here by yourself?
(A) I can’t find it.
(B) Yes, Mary brought it this morning.
(C) I’ll come over after lunch.