You are presented with the quiz "When the seasons change from the summer to the fall, the amount of what will decrease?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when the seasons change from the summer to the fall , the amount of daylight will decrease" and "daylight, sunlight, is necessary to it". 

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


 

      sunlight     