You are presented with the question "That there are seasons on Earth is partly due to: " and the following answer choices: 
- the Earth being tilted
 - mixing of air between the north and south hemispheres
 - seasonal variation of rotation speed
 - mechanical motion
 - Changes in distance between the Earth and Sun
 - Something that makes plants green
 - Earth's axis of rotation is tilted
 - Continents drifting

Now knowing 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, choose the best answer.


 

       Earth's axis of rotation is tilted  