Why Do Scientists Believe That People Who Are Under Prolonged

Why do scientists believe that people who are under prolonged periods of stress are at a higher risk for illness than people who are not?

A) People who are under stress produce more antibodies, which weakens the body's ability to fight off disease.
B) Stress suppresses the immune system, which makes individuals more vulnerable to illness.
C) Stress triggers the brain to increase the production of cytokines and white blood cells.
D) Being under continual stress causes an increase in people's type A behavior, which is associated with heart disease.