Final answer:
Carl Rogers believed that all behavior relates to one's actualizing tendency, which represents a fundamental inclination towards personal growth and fulfillment.
Step-by-step explanation:
Carl Rogers believed that all behavior relates to one's actualizing tendency. The actualizing tendency is a basic human motive towards growth, fulfillment, and the realization of one's fullest potential. Rogers's perspective is rooted in humanistic psychology, which emphasizes positive growth and self-development. This tendency drives individuals to work toward the congruence of their real self with their ideal self, through a life-long process of self-improvement and personal growth.