Cindi prefers to take exams in the late afternoon rather than during the morning because her energy level and ability to concentrate are better at that time.Her experience most likely reflects the influence of the

A) REM rebound.
B) menstrual cycle.
C) circadian rhythm.
D) hypnagogic state.

Circadian Rhythm

The internal mechanism controlling the cycle of sleeping and waking, which recurs approximately every 24 hours.

Concentrate

To focus one's attention or mental effort on a specific object, task, or goal, often by eliminating distractions.

Late Afternoon

The part of the day that extends from the mid to late afternoon, often considered to start around 3 pm and last until sunset.