Three-year-old Jonathan saw fireworks that were repeatedly followed by loud fear-producing explosive sounds. The mere sight of fireworks first began to trigger a learned fear reaction in Jonathan during the process of ___.

Acquisition

Explanation: The occurs when a previously neutral stimulus( sight of fire works) gets paired with an unconditioned stimulus(something that produces a natural stimulus without learning). The fear produced on hearing the sound of an explosive is the unconditioned stimulus. Acquisition occurs at the early stage of an individual's learning process. This is the stage at which a response is first established. The fear response as a result of the explosive sound is associated with the fireworks. Therefore, at the acquisition stage, a learned fear response is established on sighting fireworks.

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