Six identical balls are lined up along a straight frictionless groove. Two similar balls moving with speed v along the groove collide with this row on extreme left side end. Then

• A.  One ball from the right end will move on with speed \[\varepsilon \upsilon \], all the other remains at rest
• B.  Two balls from the extreme right will move on the speed u each and the remaining balls will be at rest.  
• C.  All the balls will start moving to the right with.
• D.  All the six balls originally at rest will moves on with speed \[\frac{\upsilon }{6}\] each and the two incident ball will come to rest.