How Seasons Change with Movement of the Earth

Q. What are the festivals related to moon

Q.

Question 6

The change in seasons on the earth occurs because

(a) the distance between the earth and the sun is not constant.
(b) the axis of rotation of the earth is parallel to the plane of its orbit.
(c) the axis of rotation of the earth is perpendicular to the plane of its orbit.
(d) the axis of rotation of the earth is tilted with respect to the plane of its orbit.

Q. What are the reasons for the seasons?