How Might a Psychoneuroimmunologist Explain the Increased Risk of Catching

How might a psychoneuroimmunologist explain the increased risk of catching the common cold during periods of prolonged stress?

A) Stress increases the number of natural killer cells, which attack the immune system.
B) Stress increases the number of white blood cells, making the body more susceptible to infection.
C) Telomeres are lengthened by stress, leaving cells more vulnerable to infection.
D) Stress disrupts normal chemical communication between the brain and the immune system.