20) A projectile is fired from a cliff 100 feet above the water at an inclination of 45° to the horizontal, with a muzzle velocity of 320 feet per second. The height h of the projectile above the water is given by h(x)=((-32x^2)/(320^2))+x+100 where x is the horizontal distance of the projectile from the base of the cliff. Find the maximum height of the projectile.
A) 800 ft
B) 2500 ft
C) 900 ft
D) 1600 ft