Why Do Jovian Planets Bulge Around the Equator,that Is,have a "Squashed

Why do jovian planets bulge around the equator,that is,have a "squashed" appearance?

A) They are much more massive than the terrestrial planets.
B) Their large systems of moons and rings gravitationally attract the mass around the equator more.
C) Their rapid rotation flings the mass near the equator outward.
D) Their internal heat sources exert a pressure against the sides of the planets.
E) all of the above