An Explanation for Why Polar Regions Are Colder Than Equatorial

An explanation for why polar regions are colder than equatorial regions is that:

A) The sun never reaches these areas because of the tilt of Earth on its axis.
B) Sunlight strikes the polar regions at an angle and spreads out over a much larger area.
C) Sunlight is more intense at the poles.
D) Earth is spinning slower at the poles.
E) All of these answers.