You are presented with the question "What can convert chemical energy into audible waves?" and the following answer choices: 
- a flashlight
 - electrically
 - animals
 - a firecracker
 - power stations
 - sensory neurons
 - x-ray
 - electrical light

Now knowing that afirecracker converts chemical energy into sound and energy is generated by sound waves, choose the best answer.


 

    a firecracker     