A 0.70 kg ball on a 0.20 m string rotates in a circular path in a vertical plane. If a constant angular speed of 3.0 rad/s is maintained, what is the tension in the string when the ball is at the top of the circle?

A. 0.8 N
B. 3.33 N
C. 5.64 N
D. 11.6 N