You are presented with the question "What are used to avoid stumbling around in basements?" and the following answer choices: 
- heat energy
 - eyes
 - electricity
 - Solutions
 - canes
 - arms
 - layers of fat
 - light bulbs

Now knowing that alight bulb is used for seeing in the dark and after stumbling around in the dark tunnels of the basement, Marco finds the control room, choose the best answer.


 

        light bulbs 