Kong Is Scared to Death of Bananas and Banana Peels

Kong is scared to death of bananas and banana peels. However, he watches others eat bananas and receive a rewarding piece of candy every time they throw their banana peel away. Eventually, Kong began to eat bananas and throw the peels away. Kong learned through

A) insight learning.
B) classical conditioning.
C) vicarious conditioning.
D) higher-order conditioning.