(A)  :    A bullet is fired from a gun which is initially at rest.  Total K.E. is 
                      shared by the bullet and the gun in the inverse ratio of their 
                      masses.
(R)  :   Linear momentum of the system is conserved.

• A

  If both (A) & ( R) are true and ‘R’ is the correct explanation of  ‘A’

• B

  If both (A) & ( R) are true but ‘R’ is not correct explanation of  ‘A’

• C

  If ‘A’ is false but ‘R’ is true

• D

  both ‘A’ & ‘R’ are false.