Questions17 ～ 20 are based on the following talk. You now have 20 seconds to read Questions 17 ～ 20.
Why did the pilot throw a soda bottle out of his plane window

A．Because the bottle was empty and useless.
B．Because he wanted to lighten the load of his small plane.
C．Because the bottle might be useful to the native Africans.
D．Because he wanted to amuse the local tribes people.