Final answer:
The criticism of Freud's theories being addressed implies that they were not testable, which is a methodological critique of their scientific validity.
Step-by-step explanation:
The criticism in question refers specifically to the psychoanalytic theories presented by Sigmund Freud. Marcia's thoughts on methods are not the subject of the criticism presented in the question. The provided options suggest that the criticism of Freud's theories is that they were not testable (option d). This argument points to the methodological issues in psychoanalytic theory, where some critics argue that because Freud's theories are not easily falsifiable or testable through empirical research, they fail to meet the criteria for scientific rigor.