You are presented with the question "A what is used for seeing in the dark?" and the following answer choices: 
- darkness source
 - our nearest star
 - light source
 - shade source
 - energy barrier
 - energy
 - photons
 - blackout curtain

Now knowing that alight bulb is used for seeing in the dark and an electric light bulb is a light source, choose the best answer.


 

   light source      