A pulley of radius 2 m is rotated about its axis by a force $F=(20t-5t^2)$ Newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation made by the pulley before its direction of motion if reversed, is :

Question

( A ) less than 3
( B ) more than 3 but less than 6
( C ) more than 9
( D ) more than 6 but less than 9