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: All chemical reactions require activation energy to get started., Fact2: Fire is a chemical reaction., Question: What do fires require to get started? (A) vacuum (B) heating liquids (C) energy usage (D) water (E) activation energy (F) phosphorus (G) adding heat (H) direct energy
A:
E