Billy, a Five-Year-Old Boy, Sees His Father Applying Shaving Cream

Billy, a five-year-old boy, sees his father applying shaving cream on his face while shaving his beard in front of a mirror. Billy copies his father's facial and hand movements and later that day Billy stands in front of the mirror and pretends to shave. Billy's behavior is an example of ________.

A) learning by association
B) habituation
C) dark adaption
D) mimicry