JEE Main Physics question

A ballet dancer spins with 2.8 rev s⁻¹ with her arms outstretched. When the moment of inertia about the same axis becomes , the new rate of spin is

• (A)3.2 rev s⁻¹
• (B)4.0 rev s⁻¹Correct
• (C)4.8 rev s⁻¹
• (D)5.6 rev s⁻¹