Which Statement Best Describes the Circadian Rhythm

Multiple Choice

Which statement best describes the circadian rhythm?

A) In a 24 ^-hour period of time, we feel the most awake after eating breakfast.
B) In a 24 ^-hour period of time, adults require at least 8 hours of sleep to feel rested.
C) In a 24 ^-hour period of time, we feel most sleepy during brightest period of the day.
D) In a 24 ^-hour period of time, we spend a period of time awake and a period of time asleep.