You are presented with the question "What happens when incandescent bulbs get hot" and the following answer choices: 
- energy
 - They burn out
 - sunlight
 - They glow
 - heat energy
 - They explode
 - uncontrolled
 - They turn off

Now knowing that an incandescent light bulb converts electricity into light by sending electricity through a filament and an incandescent material is so hot that it glows, producing light, choose the best answer.


 

    They glow     