单项选择题

Questions 11 to 15 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news.

Why does Nigel suggest that business travelers avoid big airports()

A.Because all flights in and out of there are full.
B.Because the volume of traffic is heavy.
C.Because there are more popular flights.
D.Because there are more delays and cancellations.