Which Example Best Illustrates Operant Conditioning

Multiple Choice

Which example best illustrates operant conditioning?

A) A man gets nauseated when he smells the same kind of food that once caused him food poisoning.
B) A man asks for a raise because, in the past, his requests have been successful.
C) A woman has been frightened by thunderstorms all her life.
D) A child watches a friend steal from a store, so he thinks he might steal sometime in the future.