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.

d. case studies of patients.

Explanation:

Freud's theory of personality is characterized by its structurality. The models we explain below should not be taken as an absolute truth. However, they are very useful tools for understanding the dynamics of the human psyche. Although they are explained separately, they are all related to each other.

Many of the observations that led to Freud's theory were based on case studies and case studies, making it difficult to generalize to a larger population. Regardless, Freud's theory changed the way we think about human mind and behavior and left a lasting imprint on psychology and culture.

After the case studies, Freud concluded that personality building becomes a product: the result of the way each person uses to deal with their internal conflicts and the demands of the outside. Personality thus masks the way in which one develops in the social environment and faces its conflicts: internal and external.