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 frequency of the rotational motion is

A) 4.00 Hz.
B) 3.67 Hz.
C) 3.18 Hz.
D) 2.83 Hz.
E) 2.15 Hz.