You are presented with the question "If what is exposed to a source of heat then that conductor may become hot?" and the following answer choices: 
- Energy.
 - heat sources
 - energy
 - coal
 - an object
 - copper
 - plastic
 - thermometers

Now knowing that if a thermal conductor is exposed to a source of heat then that conductor may become hot and copper is a great thermal conductor, choose the best answer.


 

      copper   