A、  B、  C、  C所给出的问题是一个询问原因(Why)的问句。选项(A)是回答有关When的提问，所以被排除。另外还要注意问题中的call(打电话)与选项(B)中的call(将……称为，叫做)的含义是不一样的，不要混淆

Who’s going to show the new employees around?
(A)The show is on Monday.
(B)I think Ms. Stetson will.
(C)Actually, we need something more square.

Why did Jeffery call earlier?
(A)After 9 o’clock.
(B)You can call him Jeff.
(C)He called to invite us to dinner.