Dr. gerhardt has a client who suffers from substance use disorder. in therapy, she suggests that his abusive home environment, limited sense of life purpose, and deficient dopamine reward circuits might account for his addiction. dr. gerhardt is most clearly using a(n approach to understanding addictive behaviors.

The best term that completes the given blank above is BIOPSYCHOSOCIAL. The biopsychosocial approach covers the biological, psychological, and social factors that affect the individual. And in the case of addictive behaviors, these three factors should be properly addressed in order to limit this kind of behavior. Hope this answer helps.