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AG 2 Exam 4 Psych CH 18 Solutions . 1. The effectiveness of benzodiazepines in treating anxiety disorders suggests that which of the following neurotransmitters plays a role in anxiety? a. Acetylcholine b. Gamma-aminobutyric acid (GABA) c. Dopamine d. Serotonin - Answer b. Gamma-aminobutyric acid (GABA) 2. The criteria for diagnosing generalized anxiety disorder in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, 5th edition (text revision) s...