Given the task definition and input, reply with output. 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: using a gasoline engine requires burning gasoline, Fact2: Fossil fuels include coal, oil, natural gas, and gasoline., Question: What does an engine require burning? (A) Time and energy (B) energy (C) wind (D) water (E) carbon dioxide (F) layers of fat (G) fossil fuels (H) sunlight
G