Arnold kicks a soccer ball from the top of an 8-foot platform onto the field below. The height, h, of the ball is
given by h=-16t^2 +16t+8, where t is the number of seconds after the ball is kicked. How long does the ball stay in the air before it hits the ground?
A. 0.50 second
B. 0.75 second
C. 0.90 second
D. 1.40 seconds