Every Sunday morning when Marco was a young child,his family would have a special breakfast complete with freshly baked cinnamon rolls.To this day he finds himself smiling whenever he smells cinnamon rolls baking.In this example,what is the smell of cinnamon rolls

A)  cue
B)  conditioned stimulus 
C)  unconditioned stimulus
D)  discriminative stimulus

The smell of cinnamon rolls acts as a conditioned stimulus in this scenario. Marco has learned to associate the pleasant experience of his family's special breakfasts with the smell of cinnamon rolls, leading to a positive emotional response whenever he encounters that smell again. This is a classic example of classical conditioning, where a neutral stimulus (the smell of cinnamon rolls) becomes associated with a positive experience, thus becoming a conditioned stimulus that elicits a conditioned response (smiling).