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.

d. super ego is reasonably well developed.

Explanation:

human brain has three agent i-e ego, id and superego. Superego is agent which make people conscience and guide toward good acts. It leads to protectionist and morality. This agent make people feel guilt after bad things doing. Same here Sandra feel guilt after eating cookies without her mother permission shows that her superego is well established and responded after bad doings.