A Yoyo with Moment of Inertia I and Mass M

A yoyo with moment of inertia I and mass m is hung using a light string over a frictionless pulley. A force F is applied to the other end of the string. The yoyo is allowed to unwind. As the yoyo unwinds, the force needed to stop the pulley from rotating is _____ the weight mg.

A) less than
B) equal to
C) greater than
D) depends how fast the yoyo is unwinding
E) unable to tell