Fact 1: Aflashlight requires a source of electricity to produce light.

Fact 2: Electric energy is stored in batteries.

Given the two facts above, answer the question "A flashlight requires what to produce light?" with the following options: 
- batteries
 - sunlight
 - buttons
 - calcite
 - coils
 - adding heat
 - heat energy
 - plastic


 

 batteries        