You are presented with the question "What causes water vapor to condense?" and the following answer choices: 
- water vapor exploding
 - water vapor heating up
 - water vapor disappearing
 - circulatory systems
 - aqueous solution
 - Heat energy
 - water vapor chilling
 - Evaporation

Now knowing that water vapor cooling causes that water vapor to condense and all carcasses are chilled with cool air for 48 hours, choose the best answer.


 

       water vapor chilling  