Advocates of Common Factors,such as Bruce Wampold,argue That Research Supporting

Advocates of common factors,such as Bruce Wampold,argue that research supporting the differential effectiveness of certain psychotherapies is misleading for all of the following reasons EXCEPT:

A) treatment differences ignore therapist effects resulting in overestimation of treatment effects.
B) comparison therapies used in randomized clinical trials are barely therapies at all.
C) researcher allegiance effects are larger than differences among treatment effects.
D) client selection biases in randomized controlled studies inflate treatment effects.