Two guns are mounted (fixed) on two vertical cliffs that are very high from the ground as shown in figure. The muzzle velocity of the shell from G₁ is u₁ and that from G₂ is u₂. The guns aim exactly towards each other The ratio u₁ : u₂ such that the shells collide with each other in air is (Assume that there is no resistance of air)

• A

  1 : 2

• B

  1 : 4

• C

  will not collide for any ratio

• D

  will collide for any ratio