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. In Order to get a special meal, what does the man have to do

A.Pay extra for the meal.
B.Notify the airline in advance.
C.Give the airline a few hours’ notice.
D.Get a special order from his doctor.