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

Fact 2: Electric power sources are ordinary batteries.

Given the two facts above, answer the question "What requires a battery to produce light?" with the following options: 
- flashlight
 - energy
 - mirror
 - microscope
 - direct energy
 - fire
 - cactuses
 - glowworm


 

 flashlight        