Fact 1: An incandescent light bulb converts electricity into light by sending electricity through a filament.

Fact 2: Most of the yard lamps are incandescent.

Given the two facts above, answer the question "What do yard lamps use to convert electricity to light? " with the following options: 
- heat energy
 - energy
 - Solar energy
 - transference
 - heat
 - filament
 - tube
 - metal


 

      filament   