One of the Findings in Research Comparing Cognitive Therapy to Person-Centered

One of the findings in research comparing cognitive therapy to person-centered therapy was that

A) clients stayed longer in person-centered therapy than cognitive therapy
B) effects of the two approaches were the same two years after therapy
C) the effects of the two approaches were markedly different at immediate post-test
D) the therapeutic relationship was more positive in cognitive therapy than in person-centered therapy