The Canadian Endocrinologist Hans Selye

The Canadian endocrinologist Hans Selye:

A) described the fight-or-flight response, which involves the activation of the sympathetic nervous system and the endocrine system.
B) described the general adaptation syndrome, the three-stage progression of physical changes that occur in response to intense and prolonged stress.
C) was a pioneer in health psychology who helped establish the field of biopsychosocial psychology.
D) was responsible for creating the interdisciplinary field of psychoneuroimmunology.