Psychologist: Because of a perceived social stigma against psychotherapy, and because of age discrimination on the part of some professionals, some elderly people feel discouraged about trying psychotherapy. They should not be, however, for many younger people have greatly benefited from it, and people in later life have certain advantages over the young -- such as breadth of knowledge, emotional maturity, and interpersonal skills -- that contribute to the likelihood of a positive outcome. Which one of the following most accurately expresses the main conclusion of the psychologist's argument? ["Characteristics associated with maturity are important factors in psychotherapy's success.", 'Elderly people should not be reluctant to undergo psychotherapy.', 'Elderly people are better able to benefit from psychotherapy than are younger people.', 'Certain psychotherapists practice age discrimination.']