Two Spheres,one with the Center Core Up to R =

Multiple Choice

Two spheres,one with the center core up to r = R/2 hollow and the other solid,have the same mass M and same outer radius R.If they are both rolling at the same linear speed,which one has the greater kinetic energy?

A) The both have the same kinetic energy.
B) The hollow one has the greater kinetic energy.
C) The solid one has the greater kinetic energy.
D) More information is needed to choose an answer.