You are presented with the question "The efficiency of an engine range is due to what?" and the following answer choices: 
- Movement of an air mass
 - principals of aerodynamics
 - transportation technology
 - heat production
 - heat is produced
 - A transportation fuel
 - Inches or fractions of inches.
 - chemical to mechanical energy

Now knowing that an automobile engine transforms chemical energy into mechanical energy and automobile engines have a range where they are most efficient, choose the best answer.


 

        chemical to mechanical energy 