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: when electricity flows to a light bulb , the light bulb will turn on, Fact2: Electricity is electrons in motion., Question: what flows to a light bulb to turn it on? (A) heat energy (B) protons (C) Solar energy (D) neutrons (E) direct energy (F) energy (G) electrons (H) light switch
G