You are presented with the question "What can reduce fuel usage?" and the following answer choices: 
- airplanes
 - adding heat
 - trains
 - evaporation
 - buses
 - Metling snow
 - car pools
 - exercise

Now knowing that carpooling decreases the amount of cars used to travel to a place and arrange carpools to conserve fuel, choose the best answer.


 

       car pools  