单项选择题

Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. Why is the woman waiting

A.She has to travel together with the man.
B.She doesn’t know her whereabouts well.
C.She has just missed the No.7 bus.
D.The No.7 bus is late.