The Nurse Is Administering Narcotics to Surgical Clients, and Understands

The nurse is administering narcotics to surgical clients, and understands that which of the following is correct regarding the potency of different narcotics?

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