A long horizontal conveyer belt moves with a constant velocity of 8 m/s. Two blocks A and B each of mass 2 kg are placed gently on the belt with B on A. cofficient of kinetic friction b/w A and belt is 0.1. There is no friction between A and B. Length of A is 4 m and length of B is very small (g = 10 m/s2)

If the coefficient of friction between the block B and belt is 0.4, then the separation between the two blocks when B comes to rest w.r.t. belt is :
(A) 8 m
(B) 6 m
(C) 2 m
(D) None of these