The bob A of a simple pendulum is released when the string makes an angle of ${45}^{\mathrm{o}}$ with the vertical. It hits another bob B of the same material and same mass kept at rest on the table. If the collision is elastic

• A

  Both A and B rise to the same height 

• B

  Both A and B come to rest at B

• C

  Both A and B move with the same velocity of A

• D

  A comes to rest and B moves with the velocity of A