Of the following therapies based on humanistic principles, which has accumulated the most empirical evidence for its efficacy in recent decades?

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Motivational interviewing has accumulated the most empirical evidence for its efficacy in recent decades. It has been shown to be effective in treating a variety of issues such as substance abuse, eating disorders, and health behavior change. Gestalt therapy, psychoanalysis, and existential therapy have some empirical evidence, but not as much as motivational interviewing.

Of the Following Therapies Based on Humanistic Principles, Which Has