Rogers' research on therapy focuses on changes in

A) unconscious motivations.
B) psychological needs.
C) self-concept.
D) conditions of worth.

Rogers' research on therapy mainly focused on changes in self-concept, as he believed that individuals' self-concept influenced their behavior and emotions. He emphasized the importance of a positive self-concept and believed that therapy should aim to help individuals develop a more congruent self-concept that allowed them to be their true selves. While Rogers also discussed concepts such as conditions of worth and psychological needs, his central focus was on self-concept.