You are presented with the question "What do electric devices require to function?" and the following answer choices: 
- grass
 - water
 - rays or beams
 - An object is seen
 - Power plants
 - wood
 - an electron lens
 - photons

Now knowing that electric devices require electrical energy to function and electricity or electrical energy, is produced at a power plant, choose the best answer.


 

     Power plants    