"why is petroleum the primary fuel used for transportation in the united states? i. it has a high energy value per unit volume. ii. it has quick start and stop times for providing energy. iii. it produces a low amount of pollution per joule."

Petroleum is the primary fuel used for transportation in the US because it has a high energy value per unit volume and it has a quick start and stop times for providing energy. Additionally, petroleum is extremely easy to extract, it is a high density fuel, can also be transported over long distances and provides fuel that works with our infrastructure. 

The answer is c hope this