Fact 1: Using a gasoline engine requires burning gasoline.

Fact 2: Oil and gasoline are fossil fuels.

Given the two facts above, answer the question "Fossil fuels are burned in many what?" with the following options: 
- roads
 - Fuel cells
 - solids
 - fossilized animals
 - power
 - engines
 - energy
 - Electrical


 

      engines   