Instructions: 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").
Input: Fact1: harming an animal species causes that animal 's population to decrease, Fact2: Oil spill sare harmful to animals and the enviroment., Question: What can oil spills cause? (A) A source of kitchen accidents. (B) death and devastation (C) stains (D) animal populations to decrease (E) depress neuronal excitability (F) wind and erosion (G) slipping (H) food
Output:
D