You are presented with the quiz "That there are seasons on Earth is partly due to: " 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when the season changes , the amount of daylight will change" and "the tilt of Earth's axis accounts for why there are seasonal changes in (a) the hours of daylight and (b) the intensity of solar radiation at any location on Earth". 

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


 

       Earth's axis of rotation is tilted    