According to Dr. Pagel the academic performance of a student will be affected______.A．if

According to Dr. Pagel, the academic performance of a student will be affected______.

A．if he or she is not motivated.

B．if he or she is troubled by disordered sleep.

C．if he or she is a morning type.

D．if he or she is a lazy person.

正确答案：B
解析：短文的最后一段说。Dr. Pagel认为，有睡眠障碍的学生其学业成绩是会受到影响的。