Q: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Fact1: a firecracker converts chemical energy into sound, Fact2: Energy is generated by sound waves., Question: What can convert chemical energy into audible waves? (A) a flashlight (B) electrically (C) animals (D) a firecracker (E) power stations (F) sensory neurons (G) x-ray (H) electrical light
A:
D