What Does the Nurse Responsible for Administering Narcotics to Post-Operative

What does the nurse responsible for administering narcotics to post-operative patients understand is true about the potency of narcotics?

A) Codeine is less potent than morphine; it will not produce an allergic reaction.
B) Codeine is less potent than morphine; it will not relieve pain as well.
C) Morphine is more potent than codeine; it will produce more adverse effects.
D) Morphine is more potent than codeine; a lesser dose will be required.