Polly Is Attending Her First Birthday Party, Where She Sees

Polly is attending her first birthday party, where she sees her first balloon. While playing with the balloon, she accidentally pops it with a pin. When the balloon pops, she screams, drops her drink, and starts to cry when she sees it stain the carpet. In this situation, the noise produced by the popping balloon would represent a(n)

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