Final answer:
(C) Humanism. Humanism believes that the outside world should be changed.
Step-by-step explanation:
The theory that believes that the outside world should be changed is Humanism (C). Humanism is a perspective within psychology that emphasizes the potential for good that is innate to all humans. It focuses on personal control, intentionality, and a predisposition for positive change. Humanistic psychology argues that other perspectives like psychoanalysis and behaviorism fail to recognize the depth and meaning of human experience.