The Sun does not rotate as a solid body, but it spins differentially. That means that it rotates faster at the equator of the Sun and slower at its poles. Which of the following describes why the parts of the sun rotate at different speeds?

a. The magnetic fields of the sun slow down the areas closer to the poles
b. Solar flares occur at a higher rate at the equator, causing it to move at a faster rate
c. There is more thermal energy produced at the equator
d. The sun is made up of gas