Correct Answer - Option 1 : Extinction
Conditioning is a term used to describe the process by which a neutral stimulus gains the power to elicit a specific conditioned response whereas here it is not happening.
Extinction refers to gradually diminishing the response by the repetition of the conditioned stimulus (bell) without the unconditioned stimulus. A response that has been extinguished, does come-up later on its own, this is called spontaneous recovery. At this stage, if reinforcement (US) is not presented with CS, the response extinguishes permanently.
NOTE:
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Classical conditioning: This is the simplest form of conditioning, described Pavlov, a Russian Psychologist. He associated the presentation of food to the dog with another stimulus as the sound of the bell. After giving some trials in which the bell preceded the presentation of food, the dog started salivating at the sound of the bell.
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Operant conditioning: This is another approach to the study of associative learning. The term coined by B.F. Skinner means that the likelihood of a behaviour depends on the significance of the event immediately following it to a person showing the behaviour. If the event following the behaviour is positively reinforcing or rewarding, then it will recur.
Hence, extinction is not the type of conditioning.