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: gases released during the use of fossil fuels causes global warming, Fact2: Global warming is a global environmental problem., Question: gases released during the use of fossil fuels cause a what? (A) atmospheric depletion (B) global environmental problem (C) Plant growth is reduced (D) global finances (E) depress neuronal excitability (F) DNA damage and mutations (G) global food increase (H) global water stability
B