If We Observe One Edge of a Star to Be

Multiple Choice

If we observe one edge of a star to be redshifted and the opposite edge to be blueshifted,what can we conclude about the star?

A) The star is actually two bodies,one moving toward us,the other away from us.
B) The star is in the process of falling apart.
C) The star is in the process of formation.
D) The star is rotating.
E) The star's surface is very different from one side to the other.