Which Situation Requires a Cognitive Explanation,rather Than the Traditional Mechanical

Which situation requires a cognitive explanation,rather than the traditional mechanical view of conditioning put forth by Pavlov and Skinner

A)  A dog learns to bark whenever the doorbell rings. 
B)  A girl learns to avoid a bully at school. 
C)  A toddler pretends to "cook dinner" with toys after observing his parents cooking. 
D)  A man avoids fish after getting sick at a seafood buffet.