After Prolonged Stress,you Show Symptoms of Illness,without Any Apparent Illness

After prolonged stress,you show symptoms of illness,without any apparent illness.What might be the explanation?​

A) To deal with the stress, you may have been eating foods that cause fever and sleepiness.
B) ​Stress activates the immune system, which produces fever and sleepiness.
C) ​Lack of exercise during a period of stress could lead to fever and sleepiness.
D) ​Stress can damage part of the brain, leading to fever and sleepiness.