Answer
The correct answer is:
(e) $I$ and $K_{rot}$ only
Work Step by Step
No external torque acts on the diver, so the angular momentum $L$ remains constant.
More of the mass is brought closer to the axis of rotation. This decreases the rotational inertia $I$
Since positive work was done by the diver to pull the legs inward, the system gains energy. Therefore, the rotational kinetic energy $K_{rot}$ increases.
The correct answer is:
(e) $I$ and $K_{rot}$ only
