2. The word “pitch” in the term “an elevator pitch” means ______.
选项：

A:
A: the action or manner of throwing something
B:
B: abrupt up-and-down motion (as caused by a ship or other conveyance)
C:
C: talk or arguments a person uses to persuade people to do or buy something
D:
D: the property of sound that varies with variation in the frequency of vibration