You are presented with the question "What causes a gas to condense?" and the following answer choices: 
- Energy.
 - kinetic energy
 - Water expanding
 - It gets heated up
 - It expands
 - circulatory system
 - reduced heat
 - less water

Now knowing that condensation is when change from a gas into a liquid by reducing heat energy and condensing is a gas turning into a liquid, choose the best answer.


 

       reduced heat  