You are presented with the question "What requires a source of energy to produce light?" and the following answer choices: 
- sunlight
 - cactuses
 - cakes
 - pies
 - heterotrophs
 - flashlights
 - batteries
 - most cephalopods

Now knowing that aflashlight requires a source of electricity to produce light and electrical energy is also energy, choose the best answer.


 

      flashlights   