Freud developed his theory of personality on the basis of:

A) carefully controlled experiments.
B) systematic observations of children.
C) cross-cultural investigations.
D) case studies of patients.

Case Studies

In-depth examinations of single subjects or events, often used in psychology and the social sciences to explore complex issues in real-life contexts.

Freud's Theory

A theory proposed by Sigmund Freud that emphasizes the importance of unconscious processes in shaping behaviors, personality development, and psychopathologies.

Personality

A unique set of emotional, thought, and behavioral patterns that define an individual's personal style of interacting with the physical and social environment.