单项选择题

M: We could go to a ball game this evening or would you rather eat in a restaurant and then see a film
W: To tell you the truth, I can’t really go anywhere this evening, because I’m expecting an important phone call.

Why will the woman stay home in the evening()

A. To wait for a call.
B. To watch a ball game on TV.
C. To wait for a friend.
D. To have dinner with a friend.