An airplane is flying on a straight level course at 200 Km/ hour at a height of 1000 m above the ground. An anti-aircraft gun located on the ground fires a shell with an initial velocity of 300 m/s, at the instant when the plane is vertically above it. At what inclination, to the horizontal, should the gun be fired to hit the plane ?

A 86.96°

B 79.33°

C 83.68°