Select from the following.
[I] a firework
[II] sensory neurons
[III] Gunshots
[IV] a bottle
[V] a battery
[VI] animals
[VII] a flashlight
[VIII] engines
Given those answer options, answer the question: Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Fireworks are illegal, including firecrackers. Given the two facts above, what converts chemical energy into sound?
A:
[I]