Problems with Freud's Theories Result from Which of the Following

Problems with Freud's theories result from which of the following?

A) Freud's theories are generally correct, but the problems stem from children not telling the truth in regards to their complexes.
B) Many parents will not let their children be put through the rigorous psychoanalytical tests necessary to support Freud's theories.
C) There are no problems with Freud's theories. They have withstood the test of time.
D) Because most of his theories lie at the unconscious level, they cannot be studied scientifically.