C. Different parts of the sun rotate at different rates.
Explanation:
The Sun rotates on its axis. The spin rate is different at different parts of it. This is because Sun is not a solid. It is a gas giant. Its energy or radiation is all derived from thermonuclear reactions like the proton proton cycle and the Carbon Nitrogen cycle that happen inside it.
Unless it is a solid object, something like the Earth, all parts of it cannot spin at the same rate.
