You are presented with the question "What is a way to heat a building?" and the following answer choices: 
- sound
 - Movement of an air mass
 - burning coal
 - static electricity
 - In the winter
 - potential energy
 - by indirect light
 - geothermal energy

Now knowing that energy is used for heating a building by a heating system and geothermal energy is used for heating and cooling systems, choose the best answer.


 

        geothermal energy 