Darla plans to study for an exam over a three-day period. She plans to study for four hours on ...

Darla plans to study for an exam over a three-day period. She plans to study for four hours on Tuesday. Assuming her schedule is flexible, what would be the best time for her to study on Tuesday?
 
  a. She should study for four hours in the morning, when she is feeling rested.
  b. She should study from 1:00 PM until 5:00 PM because that is when the dorm is the quietest.
  c. She should study for four hours in the evening during her regular study hours.
  d. She should distribute her study over two or three study periods throughout the day.