What is the primary reason that air above the equator is heated more than at other places on Earth?

Question

A
The sunlight coming at the equator hits at an angle.
B
The equator receives the most sunlight due to the shape of the Earth.
C
There is more water around the equator than anywhere else on Earth.
D
The tilt of the Earth on its axis causes more sunlight to reach the Equator.

Answer 1

The primary reason that air above the equator is heated more than at other places on Earth is:

B The equator receives the most sunlight due to the shape of the Earth.

This is because the equator is oriented directly towards the sun, receiving more direct sunlight throughout the year compared to higher latitudes, where sunlight hits at a more oblique angle.