Please answer the following question: Fact 1: Carpooling decreases the amount of cars used to travel to a place. Fact 2: Cars and gasoline-burning engines are large sources of emissions. Given the two facts above, answer the question "What can help decrease emissions?" with the following options: - power - exercise - Carpooling - Flying on airplanes - Having children - Eating red meat - green manures - electricity
A:
Carpooling