Which of the following statements best describes the relationship among the net external torque acting on a rigid body, the time interval during which it acts, and the body’s angular momentum about a fixed axis?
a) the change in the body’s angular momentum divided by the time interval.
b) the product of the body’s moment of inertia and its angular displacement about that axis.
c) the change in the body’s angular momentum about that axis.
d) the product of the body’s moment of inertia and its angular speed about that axis.