A 10 Kg Solid Cylinder (I = 1/2 MR²) with a Radius

Multiple Choice

A 10 kg solid cylinder (I = 1/2 MR²) with a radius of 30.0 cm is rotating about a vertical axis through its center. If the angular momentum is increasing at the rate of 25 kg m²/s², then what is the torque?

A) 70 N·m
B) 45 N·m
C) 37 N·m
D) 25 N·m
E) 12 N·m