A CD Has a Diameter of 12

Multiple Choice

A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 rad/sec², then the linear speed of a point 3.0 cm from the center of the CD after 3.0 sec is

A) 18 cm/s.
B) 21 cm/s.
C) 25 cm/s.
D) 32 cm/s.
E) 45 cm/s.