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

Fact 2: Battery can be tested with flashlight.

Given the two facts above, answer the question "a battery is a source of what that is able to produce light" with the following options: 
- energy
 - wire
 - radiation
 - heat energy
 - sunlight
 - oil
 - electricity
 - Solar energy


 

       electricity  