You are presented with the quiz "What can cause temperature fluctuations." 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "clouds are formed by water vapor rising into colder regions of the atmosphere and condensing" and "cloud cover and precipitation  cause temperature fluctuations". 

So, what's the best answer to the question?


 

       water vapor rising into colder regions of the atmosphere and condensing    