Meta-Analytic Research Studies of the Effectiveness of Self-Help Resources and Self-Administered

Meta-analytic research studies of the effectiveness of self-help resources and self-administered treatments have found that:

A) their effect sizes are generally higher than therapist-assisted interventions.
B) they are especially effective in the treatment of behavioral health disorders but not mental health disorders like anxiety,substance dependence and depression.
C) their effect sizes are almost as large as therapist-assisted interventions within the same studies.
D) they are effective for some behavioral health and mental health disorders,but not for addictive disorders.