You are presented with the question "What causes metal to heat?" and the following answer choices: 
- hydrogen and oxygen
 - electromagnetic energy
 - electricity
 - cooling nearby things
 - growth
 - absorbing energy
 - releasing energy
 - rays or beams

Now knowing that absorbing energy causes objects to heat and students test the effect of a magnet on various metal objects, choose the best answer.


 

      absorbing energy   