You Are Concerned About the Environment

You are concerned about the environment. You want to do your part to make the world more sustainable. Your environmental science professor mentions biofuels as an alternative to fossil fuels and that they have a lower carbon footprint than fossil fuels. You decide to do more research on biofuels.
-You are trying to be a more efficient driver.Which of these would help you do that?

A) using cruise control
B) commuting to and from work with someone else
C) keeping your tires properly inflated