Which of the following explains why we have seasons (summer, fall, winter, spring) on Earth?

We have hot summers and cold winters because of the tilt of the Earth's axis. The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later. In between these, Spring and Autumn will occur. The Earth revolves around the Sun.

Explanation:

d.) the area was once ocean