Don Has a Cleanliness Obsession That Revolves Around a Fear

Don has a cleanliness obsession that revolves around a fear of dirt and germs.His compulsion involves handwashing.In treatment for his disorder,Don is asked to touch all the dirty doorknobs in his therapist's office building and is told he cannot wash his hands.He and the therapist then sit together while Don tries to relax and overcome his feelings of extreme discomfort.This treatment

A) is better suited for generalized anxiety disorder.
B) has been shown to be ineffective and may even make symptoms worse.
C) is an appropriate therapy based on extinguishing a conditioned response.
D) is less effective than drugs in treating obsessive-compulsive disorder.