Why Are Jupiter and Saturn Not Perfectly Spherical

Multiple Choice

Why are Jupiter and Saturn not perfectly spherical?

A) They formed from the collision of two large planetesimals.
B) They rotate rapidly.
C) They have storms that develop preferentially along their equators.
D) They have very active aurorae that heat the atmospheres along the poles.
E) They have so much more gravity that the poles get pulled harder than the equators.