Given the task definition and input, reply with output. 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: Most carcinogens cause cancer by producing mutations in DNA., Fact2: DNA DNA is deoxyribonucleic acid., Question: Most carcinogens can cause cancer by causing mutations to what? (A) that material's properties (B) dexyribonucleic acid (C) Veins and arteries. (D) Chlorophyll (E) harmful substances (F) properties (G) a lot of human deaths (H) characteristics
B