单项选择题

Questions 1 to 5 are based on an interview. At the end of the conversation you will be give 10 seconds to answer each of the following five questions.
Now listen to the interview.
Why were female cats usually employed by the Post Office

A.They could work for 24 hours a day.
B.They were worse hunters.
C.They were more persistent hunters.
D.They worked the whole night.