Doug is driving a golf ball off the tee. His downswing takes 0.50sec from the top of the swing until ball impact. At the top of the swing, the club's angular velocity is zero; at the instant of ball impact, the club's angular velocity is 30rad/s. The swing moment of inertia of the club about the grip is 0.220kg*m^2. What average torque does Doug exert on the golf club during the downswing?

A. 13.2
B. 26.4
C. 64.6
D. 106.8