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: using a gasoline engine requires burning gasoline, Fact2: Oil and gasoline are fossil fuels., Question: What requires burning fossil fuels? (A) Fuel cells (B) using electricity (C) animals (D) Cooking (E) organisms (F) engines (G) lightning (H) solar power
A:
F