JEE Main Physics question

A ballet dancer, dancing on a smooth floor, is spinning about a vertical axis with her arms folded, with an angular velocity of rad/s. When she stretches her arms fully, the spinning speed decreases by rad/s. If is the initial moment of inertia of the dancer, the new moment of inertia is

• (A)Correct
• (B)
• (C)
• (D)