Final answer:
The tone is a neutral stimulus for a child's response of pulling the left lever in classical conditioning.
Step-by-step explanation:
The tone is a neutral stimulus for a child's response of pulling the left lever.
In classical conditioning, a neutral stimulus is a stimulus that does not initially elicit a response in an organism. In the case of Pavlov's dogs, the tone was a neutral stimulus because prior to conditioning, the dogs did not salivate when they heard the tone since the tone had no association for them.
After repeated pairings of the tone with an unconditioned stimulus (such as meat powder), the tone became the conditioned stimulus (CS) and started to elicit a response. In this case, the response of pulling the left lever is the conditioned response (CR) that occurs in anticipation of the unconditioned stimulus. Therefore, the correct option would be Neutral stimulus (B).