The Physiological Basis for Systematic Desensitization Is That ________

The physiological basis for systematic desensitization is that ________.

A) the brain habituates to greater levels of fear if they are presented in a gradual manner
B) relaxation stimulates the production of GABA neurotransmitters, which inhibit the firing of neurons in the brain
C) it is impossible for parasympathetic and sympathetic nervous systems to be dominant at the same time
D) there is no physiological basis for this behavioral technique