After her mother says, "No, you may not eat any cookies" Sandra takes some cookies from the cookie jar and eats them when her mother isn't looking. Later, she feels bad because she knows this was not a good thing to do. Sandra's attitude indicates that her:________.
a. id is in control.
b. ability to delay gratification is strong.
c. logic includes the concept of stagnation.
d. super ego is reasonably well developed.