A psychologist who decided to use behavior therapy in treating obsessive-compulsive disorder would be most likely to use which of the following procedures?

A) Encourage the person to free associate or to discuss his or her problems openly.
B) Expose the person to the distressing stimulus while preventing the compulsive behaviors.
C) Carefully explain to the person why his or her behavior is irrational.
D) Administer electroconvulsive shock therapy.

Behavior therapy for OCD typically involves exposure and response prevention (ERP), which involves gradually exposing the person to the distressing stimulus while preventing the compulsive behaviors. This helps the person to learn that they can tolerate the anxiety without giving in to the compulsions. Option A is more characteristic of psychoanalytic therapy, option C may be helpful but is not the primary approach in behavior therapy for OCD, and option D is not a recommended treatment for OCD.