What happens to the rotation of a molecular cloud as it collapses to form a star?
A) The rotation rate remains the same and results in stellar rotation.
B) The rotation dissipates and any residual is left in small overall rotation of the star.
C) The rotation rate increases and results in fast rotation of the star.
D) The rotation rate increases and results in a disk of material around a protostar.
E) The rotation increases the speed of collapse and produces more massive stars.
Answer: D