Fact 1: Alight bulb is used for seeing in the dark.

Fact 2: After stumbling around in the dark tunnels of the basement, Marco finds the control room.

Given the two facts above, answer the question "What are used to avoid stumbling around in basements?" with the following options: 
- heat energy
 - eyes
 - electricity
 - Solutions
 - canes
 - arms
 - layers of fat
 - light bulbs


 

        light bulbs 