A plane flying horizontally at a height of 1500 m with a velocity of 200 `ms^-1` passes directly overhead an antiaircraft gun. Then the angle with the horizontal at which the gun should be fired for the shell with a muzzle velocity of 400 `ms^-1` to hit the plane, is

Options

A. 90°
B. 60°
C. 30°
D. 45°