单项选择题

Questions 4 to 7 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.

What does Ms. Cook imply that her main purpose was in coming to this town

A.To attend a conference.
B.To see the planetarium.
C.To change planes.
D.To go sightseein