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: carpooling decreases the amount of cars used to travel to a place, Fact2: And fewer cars means less pollution., Question: What does carpooling lead to? (A) animal transport (B) lowered energy cost (C) Less pollution (D) population movement (E) Less time (F) competition (G) More cars (H) More roads
A:
C