Paige is a conscientious student

Even on the weekend, she never stays up past 2 A.M. to socialize. She works weekends from 7 A.M. to 3 P.M. and does not nap. On Monday, she has four classes. On Monday night, she goes to bed early, and the rest of the week she gets 7 to 8 hours of sleep. Which of the following is most likely?
a) There is no difference in her ability to learn on Monday compared to the rest of the week.
b) Her learning ability is impaired on Monday by sleep deprivation.
c) Her learning ability will peak on Monday after her refreshing weekend.
d) Her learning ability is improved Monday by having some recreation on weekend nights.

Answer: b