Which of the following statements, if true, would most weaken John's conclusion? A. Behavior therapy is designed to address different problems from those addressed by "talk" therapies. B. The techniques used in behavior therapy are quite different from those used in "talk" therapies. C. People who try several different types of psychotherapy tend to be happier than people who try only one type of psychotherapy. D. People who try several different types of psychotherapy are more likely to find one that works for them than are people who try only one type of psychotherapy. E. People undergoing psychotherapy that ultimately works are often unhappy while they are in therapy.