Cassie asked her father for a candy bar at the grocery store,and her father bought her the candy bar.If Cassie asks for more candy bars in the future,then what is the candy bar

A)  conditioned response 
B)  discriminative stimulus 
C)  reinforcer 
D)  conditioned stimulus

Discriminative Stimulus

A stimulus in the presence of which a particular response will produce reinforcement or a specific outcome, but will not do so in its absence.

Reinforcer

Any stimulus that strengthens or increases the probability of a specific response or behavior by providing a consequence an individual finds rewarding.