Morphine and Hydromorphone (Dilaudid)are Two Types of Opioid Receptor Agonists

Morphine and hydromorphone (Dilaudid) are two types of opioid receptor agonists used for pain management.Hydromorphone is a more potent drug than morphine,and lower doses are needed to control pain.How do actions at receptor sites explain this difference?

A) Morphine remains bound to opioid receptors longer than hydromorphone does.
B) Hydromorphone remains bound to opioid receptors longer than morphine does.
C) Morphine is metabolized and eliminated at a faster rate than hydromorphone.
D) Hydromorphone is metabolized and eliminated at a faster rate than morphine.