Why Is Naloxone Considered a Pure Antagonist

Multiple Choice

Why is naloxone considered a pure antagonist?

A) In the presence of a high concentration,it behaves like a pure antagonist.
B) It binds to an alternative site on the same receptor site as the agonist.
C) It reverses the effect of the receptor by occupying the receptor site and preventing another drug from binding.
D) It has an affinity at the receptor site but produces an opposite action.