You are presented with the question "What is helpful for seeing in the dark?" and the following answer choices: 
- an electron microscope
 - an electron lens
 - microscope
 - closing the blinds
 - blackouts
 - closing your eyes
 - focusing a lens
 - heating a filament

Now knowing that alight bulb is used for seeing in the dark and conventional light bulbs generate light by heating a filament, choose the best answer.


 

        heating a filament 