Little Mark Was Stung by a Bee While Playing in the Hay

Multiple Choice

Little Mark was stung by a bee while playing in the hay in his grandfather's barn. The next time his cousin wanted him to play in the barn, little Mark ran to his grandmother crying and refused to go near the barn. Little Mark's fear of the barn most likely occurred due to:

A) operant conditioning.
B) insight learning.
C) cognitive learning.
D) classical conditioning.