I Am Walking in the Park and a Snake Falls

Multiple Choice

I am walking in the park and a snake falls out of a tree and lands on my head. I am panic?stricken because I am very frightened of snakes. The next day, I am afraid to go to the park. In this scenario, the park has become

A) unconditioned stimulus.
B) conditioned stimulus.
C) unconditioned response.
D) conditioned response.