A bag of sand of mass M is suspended by a string. A bullet of mass m is fired at it with velocity v and gets embedded into it. The loss of kinetic energy in this process is
A. `(1)/(2)mv^(2)`
B. `(1)/(2)mv^(2)xx(1)/(M+m)`
C. `(1)/(2)mv^(2)xx(M)/(m)`
D. `(1)/(2)mv^(2)((M)/(M+m))`