The fact that Allison was startled by a dog in a park caused her to develop a conditioned response to having the same reaction to seeing another dog in a new park.
It is considered as a learned psychological response to a stimulus that was previously neutral, which was associated with an unconditioned stimulus to generate conditioning.
Therefore, the fact that Allison first had an unconditioned stimulus, when she was frightened by a dog, caused her to develop a conditioned response when facing the same situation on other occasions.
The correct answer is:
D. Conditioned response
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