Which of the Following Is NOT a Valid Criticism of Freud's

Which of the following is NOT a valid criticism of Freud's theory of personality?

A) Freud based his theory on self-analysis and on his analysis of a small number of patients.
B) Many of Freud's psychoanalytic concepts are so vague that they are impossible to objectively measure or confirm.
C) Freud did not keep detailed records of his therapy sessions with his patients, so it is impossible to objectively verify his observations.
D) Freud's lifelong addiction to cocaine distorted his thinking.