The Phenomenon of Spontaneous Recovery Provides Support for the Idea

The phenomenon of spontaneous recovery provides support for the idea that:

A) a conditioned response that is extinguished is not unlearned or completely eliminated.
B) a conditioned stimulus can return to being a neutral stimulus after extinction.
C) stimulus generalization is a stronger, more easily produced response than stimulus discrimination.
D) it is easier to produce learned associations between natural stimuli than artificial stimuli.