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 hand washing.If he believes he has touched something unclean,he will wash his hands until they are raw.In treatment for his disorder,Don is asked to touch all the doorknobs in his therapist's office building and then is told that 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 unethical and would not be used today.
B) has been shown to be ineffective and may even cause worsening of symptoms.
C) is an appropriate therapy based on extinguishing a conditioned response.
D) is less effective than tranquilizers in treating obsessive-compulsive disorder.