You are presented with the quiz "What causes differing light to reflect off of the moon?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the moon revolving around the Earth causes the phases of the moon" and "phases of the Moon are caused by differing amounts of light reflected from the Earth". 

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


 

   The revolution around earth        