Which of the following represents a distinction, in Freudian theory, between the ego and the ...

Which of the following represents a distinction, in Freudian theory, between the ego and the superego?
 
  a) The ego is governed by the reality principle, while the superego is concerned with morality and ethics.
   b) The ego is governed by the pleasure principle, while the superego is concerned with morality and ethics.
   c) The ego is concerned with fulfilling instinctual desires, while the superego mediates between desires and reality.
   d) The ego emerges in the first five years of life, while the superego does not emerge until the teenage years.