JEE Main 2019 Physics question

A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of θ, where θ is the angle by which it has rotated, is given as . If its moment of inertia is I then the angular acceleration of the disc is:

• (A)
• (B)
• (C)
• (D)Correct