Therapist: Cognitive psychotherapy focuses on changing a patient' s conscious beliefs. Thus, cognitive psychotherapy is likely to be more effective at helping patients overcome psychological problems than are forms of psychotherapy that focus on changing unconscious beliefs and desires, since only conscious beliefs are under the patient' s direct conscious control. Which one of the following, if true, would most strengthen the therapist's argument? ['Psychological problems are frequently caused by unconscious beliefs that could be changed with the aid of psychotherapy.', "It is difficult for any form of psychotherapy to be effective without focusing on mental states that are under the patient's direct conscious control.", "Cognitive psychotherapy is the only form of psychotherapy that focuses primarily on changing the patient's conscious beliefs.", "No form of psychotherapy that focuses on changing the patient's unconscious beliefs and desires can be effective unless it also helps change beliefs that are under the patient's direct conscious control."]