单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.

Why do men and women have different patterns of abilities

A.Because they have different overall levels of intelligence,
B.Because their genetic materials are different.
C.Because hormonal influences are different on their developing brains.
D.Because they differ in physical attributes.