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 is used for stopping a vehicle by brakes, Fact2: Cars are vehicles and trucks are vehicles., Question: what uses friction for stopping with brakes? (A) humans (B) lynx (C) cars (D) oxygen (E) people (F) bumpers (G) coyotes (H) cows
A:
C