Which Statement Is True of the Meta-Analytic Findings of Research

Which statement is true of the meta-analytic findings of research therapy with children?​

A) Changes achieved by children receiving treatment are the same as those for children not receiving treatment.
B) Treatment effects are smaller for problems that are specifically targeted than they are for nonspecific areas of functioning.
C) Treatments have been shown to be more effective for internalizing that for externalizing disorders.
D) Treatments have been shown to be effective for children with a wide range of problems.