Research on the Effectiveness of Therapy Has Shown That Those

Research on the effectiveness of therapy has shown that those receiving therapy ____.

A) usually end up no better off than those who did not receive therapy
B) generally end up better off than those who do not receive any form of therapy, but not better off than those taking a placebo
C) generally end up better off than those taking a placebo, but not better off than those who do not receive any form of therapy
D) generally end up better off than both those who do not receive therapy and those who take placebos