Perhaps the Greatest Contribution of the Humanistic Approaches Has Been

Perhaps the greatest contribution of the humanistic approaches has been

A) the experiential approach developed by Al Mahrer at the University of Ottawa.
B) the process experiential approach developed by Les Greenberg and his colleagues at York University in Toronto.
C) the emphasis that this approach places on the unconscious processes of the client.
D) the emphasis that this approach places on the human qualities of the therapist.
E) the empty chair technique developed by Fritz Perls.