You are presented with the question "What causes seasons to change?" and the following answer choices: 
- Time and energy
 - gravity
 - orbital tilt
 - clouds
 - global warming
 - weather
 - climate
 - an object

Now knowing that earth orbiting the Sun causes seasons to change and seasons on the earth are due to the tilt of the earth's axis, choose the best answer.


 

   orbital tilt      