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: the emission of sulfur dioxide causes acid rain, Fact2: An erupting volcano emits sulfur dioxide., Question: What causes acid rain? (A) Pesticides (B) fossil fuels (C) remains of prehistoric life (D) chlorofluorocarbons (E) energy of moving objects (F) an erupting volcano (G) harmful substances (H) forest is destroyed
A:
F