Six steel balls of identical size are lined up along a straight frictionless groove. Two similar balls moving with speed `v` along the groove collide with this row on the extreme left end. Then
A. One ball from the right rolls out with a speed 2 v and the remaining balls will remain at rest
B. Two balls from the right roll out with speed v each and the remaining balls will remain stationary
C. All the six balls in the row will roll out with speed v /6 each and the two colliding balls will come to rest
D. The colliding balls will come to rest and no ball rolls out from right
