Substantial Evidence Suggests That Acute (Short-Duration) Stress Exposure Has Which

Substantial evidence suggests that acute (short-duration) stress exposure has which of the following effects on the immune system?

A) Suppression of immune function.
B) Enhancement of immune function.
C) Exposure to short-duration stressors does not alter immune function.
D) To date, studies exploring the effects stress on immune function have all used chronic stressors; the effects of short-duration stressors are not known.