A hollow smooth uniform sphere A of mass 'm' roll without sliding on a smooth horizontal surface. It collides elastically and head on with another stationary solid sphere B of the same mass m and same radius. The ratio of kinetic energy of 'B' to that of 'A' just after the collision is

Question

$$\begin {array} {1 1} (a)\;5:2 & \quad (b)\;1:1 \\ (c)\;2:3 & \quad  (d)\;3:2 \end {array}$$