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: an automobile engine transforms chemical energy into mechanical energy, Fact2: Gasoline is a mix of hundreds of chemicals., Question: What do cars use for energy? (A) engines (B) Energy. (C) heat (D) Gasoline (E) energy (F) fossil fuels (G) coal (H) photons
A:
D