A ball of mass `m` moving with speed `v_(0)` strikes a block of mass `3 m` kept at rest. The collision is completely inelastic . If `k` is spring constant , the maximum compression of the spring is
A. `sqrt((mv_(0)^(2))/(k))`
B. `sqrt((mv_(0)^(2))/(2k))`
C. `sqrt((mv_(0)^(2))/(3k))`
D. `sqrt((mv_(0)^(2))/(4k))`