Neurobiological Factors Involved in Panic Disorder and Generalized Anxiety Disorder

Neurobiological factors involved in panic disorder and generalized anxiety disorder provide evidence for the hypothesis that

A) both disorders are caused by an excess of the GABA neurotransmitter.
B) the two disorders are genetically identical.
C) panic may be an acute version of generalized anxiety disorder.
D) fear and anxiety are fundamentally distinct.