Why Can Stress Indirectly Cause Illness

Why can stress indirectly cause illness?

A) Stress tends to lead to premature nerve cell death.
B) The hormones released during stress are the actual cause of illness,not the stress itself.
C) People under a great deal of stress are less likely to engage in actions that promote good health.
D) The mind of a stressed person is racing so fast that it burns energy that could be used for other purposes.