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: the vanes rotating in an electric fan causes air to move, Fact2: Turbines are usually made with a series of curved vanes on a central rotating spindle., Question: what part of an electric fan causes air to move? (A) cover (B) mechanism (C) heat energy (D) electrically (E) turbines (F) cycles (G) fan base (H) heat
E