In a 24-Hour Period, Most Preschoolers Sleep

In a 24-hour period, most preschoolers sleep:

A) fifteen to sixteen hours at night and two hours during the day.
B) three to four hours at night and take two naps of three hours each during the day.
C) nine to ten hours at night and take a nap of one to two hours.
D) eleven to twelve hours at night and six hours during the day.