If the seasons change on Earth because the axis of rotation is tilted, then that there are seasons on Earth is partly due to:?

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

 

       Earth's axis of rotation is tilted   