Amelia, a 6-Week-Old Baby, Lies Peacefully in a Crib, Sucking

Multiple Choice

Amelia, a 6-week-old baby, lies peacefully in a crib, sucking a pacifier. Her elder brother, who was sent to stay with their grandparents at the time of her birth, returns home. He walks toward the crib and calls out her name. She looks at him, stops sucking, and starts to cry. In this scenario, Amelia's reaction toward her brother best illustrates

A) categorization.
B) deferred imitation.
C) dishabituation.
D) operant conditioning.