The Nurse Administers Narcotics to a Surgical Patient

The nurse administers narcotics to a surgical patient. Which statement represents the nurse's best understanding as it relates to the potency of different narcotics?

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