Don's therapist has directed him to document on a daily basis the times, places, and conditions under which he goes to smoke a cigarette. Don discovers that he often ends up smoking outside his office building with his boss and enjoys the chance to chat with her. The therapist explains to Don that these conversations are: a. a kind of counterconditioning. b. a form of transference. c. unconditional positive regard. d. acting as a reinforcer.