A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?

In "free space," there is no external torque acting on the sphere (${\tau }_{ext}=0$).By the Law of Conservation of Angular Momentum, $L=I\omega =\text{constant}$.When the radius $R$ increases, the moment of inertia $I=\frac{2}{5}m{R}^2$ increases.To keep $L$ constant, the angular velocity $\omega$ must decrease.Rotational kinetic energy $K_{rot}=\frac{L^2}{2I}$ will decrease as $I$ increases.Thus, only angular momentum remains unaffected.