Which of the hypothesized common factors in psychotherapy has received the most research attention?

Question

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The therapeutic alliance, which refers to the relationship between the therapist and client, has received the most research attention among the hypothesized common factors in psychotherapy. Empathy and confronting problems in therapy are also important factors, but they have not received as much research attention as the therapeutic alliance. Sense of mastery in the client is not considered one of the hypothesized common factors in psychotherapy.

Which of the Hypothesized Common Factors in Psychotherapy Has Received