When the Brelands Tried to Teach Pigs and Raccoons to Drop

Multiple Choice

When the Brelands tried to teach pigs and raccoons to drop a coin into a box,the animals:

A) learned the trick only if explicit reinforcement was provided for doing so.
B) learned the trick if food was used as a reinforcer but did not learn the trick if secondary reinforcement was used.
C) had difficulty learning the trick because it competed with their biological tendencies.
D) failed to learn the trick,indicating that some animals have evolved to be resistant to operant conditioning.