单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.

What is necessary for a horse trainer

A.He can make the wild horse under control.
B.He would not be disturbed by other disturbances.
C.He can understand the horse’s special habits.
D.He needs to be patient and understanding.