A smooth ring is fixed horizontally on a smooth horizontal surface. From a point A of the ring, a particle is projected at an angle `'theta'` to the radius vector at A. If the coefficient of restitution between the find and the particle is 0.5 and the particle returns to the point of projection A after two reflection, then `cot^(2) theta` is equal to

Options

A. 10
B. 12
C. 11
D. 14

Answer

D