A string of length l, tied to the top of a pole, carries a ball at its other end as shown. On giving the ball a single hand blow perpendicular to the string, it acquires an initial velocity $$v_0$$ in the horizontal plane and moves in a spiral of decreasing radius by curling itself around the pole. Therefore,

A

the instantaneous centre of revolution of the ball is the point of contact of the string with the pole at that instant

B

the instantaneous centre of revolution of the ball will be fixed at the point where the string was initially fixed

C

the angular momentum of the system will not be conserved

D

the angular momentum of the system will be conserved