You are presented with the question "an incandescent light bulb converts electricity into light by sending electricity through what?" and the following answer choices: 
- hair-thin molecules
 - hair-thin spokes
 - epidermis and dermis
 - hydrogen and oxygen
 - activation energy
 - an electron lens
 - hair-thin hairs
 - hair-thin fibers of glass

Now knowing that an incandescent light bulb converts electricity into light by sending electricity through a filament and fiber optics works by carrying light along hair-thin filaments of glass, choose the best answer.


 

        hair-thin fibers of glass 