Correct Answer - A
When the person jumps off the round, radially away from the centre, no torque is exerted i.e. `tau = 0`.
According to the principle of conservation of angular momentum, `I xx omega =` constant. As mass reduces to half (from `2 M` to `M)`, moment of inertia `I` becomes half. Therefore, `omega` must become twice `(=2 omega)`.