You are presented with the question "What is a cause of fog?" and the following answer choices: 
- evaporation
 - heating liquids
 - condensation
 - transpiration
 - scattered light
 - Pollution
 - Water expanding
 - droplets of lemonade

Now knowing that condensation causes clouds to form and fog is a cloud that forms on the ground, choose the best answer.


 

   condensation      