Steven Spielberg's classic movie Jaws was a thriller about a great white shark that terrorized tourists at a local beach. Just before the shark's appearance, eerie music began playing. As the unseen shark came closer, the tempo of the music picked up. After the audience had experienced this a few times, the sound of the music triggered the emotional reaction of fear in the audience even though the shark still had not appeared. At that point, the sound of the eerie music was a(n):

Explanation: A conditional stimulus is one that associates with an unconditioned stimulus, and which repeated itself several times during the unconditioned stimulus and remained in our memory as a trigger and association for the unconditioned stimuli.

In the specific example, the appearance of a shark or the knowledge that it will occur is an unconditional stimulus that causes us to fear what would be an unconditional response. When, during the scene of the shark approaching, some creepy music goes several times, that is, in several such scenes, next time it is enough to hear the creepy music and connect it with the appearance of the shark even though we have not seen it, so that we can feel fear.

This means that we associate creepy music with unconditional stimuli - the shark and feel fear - unconditional response, creepy music is a conditional stimulus.