Q: 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: pushing on the pedals of a bike cause that bike to move, Fact2: Well, when riding a bike, human power is used to turn the pedals., Question: What causes a bike to move? (A) Coal power (B) energy (C) friction (D) magic (E) mechanical (F) Human power (G) Dog power (H) Energy.
A:
F