Answer:
The correct answer is 3. Neutral stimulus
Explanation:
Behavior is the result of learning based on a physiological reflex. Classical conditioning learning is a process by which the properties of a conditioned stimulus are associated with a neutral stimulus. It is produced by relating the neutral stimulus to the conditioned stimulus. The neutral stimulus carries any response, and the unconditioned stimulus produces an unconditional response. After several repetitions, the association will have produced the same consequences by exposure to the neutral stimulus as those produced by the unconditioned stimulus.