Fact 1: Using a gasoline engine requires burning gasoline.

Fact 2: When they are burned, fossil fuels are consumed.

Given the two facts above, answer the question "Using a gasoline engine requires doing what to gasoline?" with the following options: 
- Dehydration
 - Cooking
 - Smoking
 - energy usage
 - vaporization
 - consuming
 - adding heat
 - evaporation


 

      consuming   