A Solid Sphere of Radius R Rotates About a Diameter $\omega$

Multiple Choice

A solid sphere of radius R rotates about a diameter with an angular speed $\omega$ . The sphere then collapses under the action of internal forces to a final radius R/2. What is the final angular speed of the sphere?

A) $\omega$ /4
B) $\omega$ /2
C) $\omega$
D) 2 $\omega$
E) 4 $\omega$