The Nurse Administers Narcotics to Surgical Patients

The nurse administers narcotics to surgical patients. 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.