Some Reasons Put Forth to Explain the Declining Difference in Outcome

Multiple Choice

Some reasons put forth to explain the declining difference in outcome effects between cognitive and noncognitive therapies include all of the following EXCEPT:

A) limited training of those conducting cognitive therapy.
B) reduced influence of effects related to investigator allegiance.
C) dilution of the therapy's power as it was disseminated beyond those in pioneering groups.
D) improved methodological rigor of contemporary research studies.