Some Bears Kept in the Zoo Allow Veterinarians to Routinely

Multiple Choice

Some bears kept in the zoo allow veterinarians to routinely give them total body checkups.These bears open their mouths for teeth cleaning and present their paws for nail clipping.Your friend wonders how anyone could ever get these dangerous animals to be so cooperative without anesthesia.You,however,a psychology student,quickly surmise that the bears had undergone _____.

A) discovery learning
B) classical conditioning
C) secondary reinforcement
D) operant conditioning