In Terms of Psychoanalytic Theory, Which of the Following Statements

In terms of psychoanalytic theory, which of the following statements about defense mechanisms is most accurate?

A) Children are so honest that they use only coping mechanisms.
B) Only very neurotic people use defense mechanisms.
C) The basic function of defense mechanisms is to protect the person from being overwhelmed by painful thoughts and feelings such as anxiety and guilt.
D) After a long period, defense mechanisms lead to higher levels of functioning.