In the Laboratory,a Solid Cylinder Is Permitted to Roll Down $\omega$

Multiple Choice

In the laboratory,a solid cylinder is permitted to roll down a plane inclined at an angle with the horizontal.If no slipping occurs,which of the following is true?

A) No slipping implies no frictional force to consider.
B) Because there is no slipping,the motion of the cylinder can be considered to be a pure rotation about the center of mass.
C) The change in potential energy is equal to I₀ $\omega$ ².
D) The acceleration of the center of mass can be expressed in terms of the acceleration due to gravity and $\theta$ .
E) The only force acting on the cylinder is that of gravity.