In classical conditioning, occurs when the conditioned stimulus is no longer paired with the unconditioned stimulus.

Extinction

Explanation:

Extinction is defined as the weakening and in some cases, a total disappearance of a response that is learned. In classical conditioning, extinction occurs when the conditioned stimulus is no longer connected or paired with the unconditioned stimulus. This results to the conditioned response to cease.

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;

well wheres the question