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").
Q: Fact1: the emission of sulfur dioxide causes acid rain, Fact2: ACID RAIN Acid rain is polluted and harmful to the environment., Question: The environment is polluted when what is emitted? (A) fossil fuels (B) humans disturb it (C) Organic compounds (D) harmful substances (E) chlorofluorocarbons (F) carbon dioxide (G) sulfur dioxide (H) Greenhouse gases
A:
G