Researchers Investigated the Effects of Rather Commonplace Stressors Such as the Numerous

Researchers investigated the effects of rather commonplace stressors such as the numerous exams that medical students have to take each year. They discovered that exposure to such ordinary stressors of life:

A) does not affect immune system functioning.
B) builds up greater immunity to bacteria, viruses, and other foreign invaders.
C) adversely affects immune system functioning.
D) decreases the levels of both corticosteroids and catecholamines in the body.