You are presented with the question "Toasters convert what into an energy that can also light and cook?" and the following answer choices: 
- hydrogen and oxygen
 - solar energy
 - deoxyribonucleic acid
 - electrical energy
 - objects that have mass
 - chemical messengers
 - water energy
 - wind energy

Now knowing that atoaster converts electrical energy into heat energy for toasting and early in human history, energy was first used by people for heating, lighting, and cooking, choose the best answer.


 

    electrical energy     