You are presented with the question "What is used for used for seeing in the dark?" and the following answer choices: 
- It gets more light
 - Magnifying glass
 - Heating a metal filament.
 - our nearest star
 - Eyeglasses
 - Electrical energy
 - Electric devices
 - Binoculars

Now knowing that alight bulb is used for seeing in the dark and incandescent lights heat a metal filament that radiates light inside a glass bulb, choose the best answer.


 

   Heating a metal filament.      