Detailed Instructions: 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: friction causes an object to lose energy, Fact2: With less energy, the electron slows down., Question: What causes an object to slow down? (A) sweating (B) hormones (C) quadriceps (D) smooth surfaces (E) electrically (F) friction (G) speed (H) lack of friction
A:
F