Which of the following is the cause of the change of seasons?

a.  The distance of a place from the Equator

b.  The rotation of the Earth

c.  Prevailing winds blowing across land or water

d.  the tilt of the Earth's axis

d.  The tilt of the Earth's axis is the main cause of seasonal change. 

Without the tilt, we would experience the same conditions (for the most part) all year-round.