When sam was on summer vacation after ninth grade, he allowed his body to shift toward a more natural rhythm. it's most likely that his parents noticed that sam both

A: delayed bedtime; and established an earlier wake time.

B: delayed bedtime; and delayed wake time.

C: maintained the same bedtime; and established an earlier wake time.

D: maintained the same bedtime; and delayed wake time.

B: delayed bedtime; and delayed wake time.

Explanation:

As Sam is in vacation after ninth grade, we can assume that he is a teenager and teenagers have different sleeping patterns in which they go to bed late at night and remain sleep later during the day. However, when they are in school they have to go to bed early as they have to wake up early. Because of that, when Sam was on a summer vacation, it's most likely that his parents noticed that Sam delayed bedtime and delayed wake time.

because the early people found out about it.