When Luis Was a Child,he Really Liked the Smell of the Rose-Scented

Multiple Choice

When Luis was a child,he really liked the smell of the rose-scented perfume his mother always wore.He came to associate that scent with snuggles and hugs from his mom.As an adult,Luis feels calm and contented when he smells any floral scent,including lilacs and wildflowers.What process does this illustrate

A)  spontaneous recovery 
B)  stimulus generalization 
C)  instinctive drift 
D)  stimulus discrimination