You are presented with the question "What is moved by mechanical energy in an automobile?" and the following answer choices: 
- vehicles
 - brake pad
 - humans
 - animals
 - people
 - gas pedal
 - pistons
 - seatbelt

Now knowing that an automobile engine transforms chemical energy into mechanical energy and engines convert some energy of it to move the pistons (to work), choose the best answer.


 

       pistons  