A、  B、  C、  C所给出的问题是询问原因(Why)的疑问句。因此选项(C)用because作为回答是最恰当的。要注意虽然问题中出现了early，但本题并不是与时间有关的对话，不要因此而误选选项(A)。

Would you rather look for a jacket at the mall or order one online?
(A)Let’s wait in line.
(B)I didn’t see Jack there.
(C)I’ll look at the mall first.

Why are we getting paid early?
(A)Not until tomorrow.
(B)O.K., I’ll check on them.
(C)Because Friday is a holiday.