Richard would define the inclination of the Earth’s axis in relation to its plane of orbit around the Sun as the planet’s axial tilt.
This is also referred to as obliquity and it is defined as the angle or the inclination that a planet's rotation axis makes with the plane of its orbit which in the case of Earth it is 23.5 degrees.
The Earth and other planets orbit the sun because of the Sun's gravity which helps to keep them in their various orbits in the solar system thereby preventing them from collapsing into one another.
This ios therefore the reason why Axial tilt was chosen as the correct choice.
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