Which of the following makes the best introductory sentence?
A.
Not getting enough sleep at night can cause students to become drowsy during the school day.
B.
Starting the school day at 8:45 a.m. instead of 7:45 a.m. would be beneficial for several reasons.
C.
Not getting enough sleep each night over a period of six months or longer can be harmful to a person's health.
D.
Studies show that melatonin, a brain chemical that causes sleep, is produced later at night in teens than in adults.
