Edward has a fear of being contaminated when shaking hands with others, touching doorknobs, and being in crowded public spaces, such as subway cars. he washes his hands roughly 100 times a day. his doctor has recently prescribed an antidepressant to increase his level of serotonin. which approach to psychological disorders does this exemplify? question 5 options: the psychotherapeutic model the biological model the psychological model the self-actualization model