Which of the following is?

Question

Which of the following is a cause of Earth's seasons?

Earth's distance from the sun

revolution of Earth around the sun

tilt of Earth's axis

both b and c

Answer 1

The tilted axis is the number one reason, but it also requires the planets orbit around the sun.  Before the tilted axis, there were no seasons.

Answer 2

Didn't they already teach you that in school?

Answer 3

earths tilt on its axis.

but there are only seasons in some latitude/longitude regions

Answer 4

revolution of Earth around the sun plays a major role

Answer 5

b and c