单项选择题

Questions 11 to 13 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.

Which of the following is NOT the consequence of lack of sleep

A.People tend to feel exhausted frequently.
B.People can’t concentrate on things well.
C.People will be unable to store information.
D.People will be unable to count numbers.