Which of the Following Statements Supports the "Preservation and Protection

Multiple Choice

Which of the following statements supports the "preservation and protection" hypothesis of sleep?

A) People tend to require more sleep after a hard day of work.
B) Sleep deprivation can lead to impaired cognitive abilities.
C) Jet lag is usually worse when traveling east than it is when traveling west.
D) Many small animals sleep during the day, when they could be easily seen by a predator.