One Time of Day When Sleepiness Is Usually at Its

One time of day when sleepiness is usually at its strongest is during mid-afternoon, at about 3:00 p.m. Researchers have found that

A) it is during these hours that sleep-related traffic accidents peak
B) cultures in which afternoon naps are common exhibit a better quality of life
C) this is the time that our internal body temperature is at its peak
D) this period of the day is associated with a reduction in the rate of business transactions.