Kelly's personality theory derived from

A) his experience as a clinician.
B) the laboratory.
C) observations of infants and children.
D) interpretations of social and historical factors.

Kelly's personality theory was largely derived from his experience as a clinical psychologist working with patients, rather than from laboratory research or observations of infants and children. He developed his theory through years of observing and working with clients in therapy and refining his ideas based on the insights gained from these interactions.