Three particles each of mass m are located at vertices of an equilateral triangle ABC. They start moving with equal speeds each along the meridian of the triangle and collide at its center G. If after collisions A comes to rest and B returns its path along GB, then C

• A

   also comes to rest

• B

   moves with a speed along CG

• C

  moves with a speed along BG
   

• D

   moves with a speed along AG