A Trained Dolphin Will Only Do a Particular Trick When

Multiple Choice

A trained dolphin will only do a particular trick when the trainer gives a specific hand signal.When the trainer gives different hand signals,the dolphin does other tricks,thus illustrating that the dolphin's behaviour is under stimulus control.The dolphin's behaviour also best illustrates which of the following?

A) operant discrimination
B) positive reinforcement
C) avoidance conditioning
D) higher-order conditioning