Solana Got a New Puppy and She Keeps the Puppy's

Multiple Choice

Solana got a new puppy and she keeps the puppy's treats in a ceramic jar that makes a distinctive 'clunk' sound when the lid is put on or taken off.At first,the puppy comes when he sees or smells the food,but after a while,he just must hear the sound of the jar to come running.In this example,the puppy's coming to the sound of the jar is the

A) conditioned stimulus.
B) unconditioned stimulus.
C) conditioned response.
D) unconditioned response.