A CD Has a Diameter of 12

Multiple Choice

A CD has a diameter of 12.0 cm.If the CD is rotating at a constant angular velocity of 20.0 radians per seconds,then the period of the rotational motion is

A) 0.314 s.
B) 0.441 s.
C) 0.582 s.
D) 0.698 s.
E) 0.750 s.