Researchers Who Are Trying to Teach a Raccoon to Drop

Researchers who are trying to teach a raccoon to drop coins into a bank to receive reinforcement eventually pair the coins with food. From that moment on, the raccoon begins to persistently rub the coins together when it encounters them, even when that behavior is not reinforced. This "misbehavior" is most likely an example of

A) an adjunctive behavior.
B) negative automaintenance.
C) intrusion of a natural defensive behavior.
D) the action of cessation cues.