Regarding Outcome Research on Existential Psychotherapies,the Current Research Literature Has

Regarding outcome research on existential psychotherapies,the current research literature has revealed:

A) their relative success compared to no treatment and other therapies.
B) that existential therapies are more effective than traditional psychoanalysis,but less effective than behavioral therapy for some kinds of problems.
C) that existential therapies are more effective for adolescents,college age students and young adults than any other therapy.
D) no controlled research or meta-analytic studies to evaluate its effectiveness.