The distance of an object thrown upward is modeled by the equation h=-16t+8t+1.25, where h is the height of the object in feet at any given time and t is the time in seconds. The object is visible whenever it is at h ≥ 0. For how long is the object visible? A. about 0.13 seconds B. about 0.50 seconds C. about 0.63 seconds D. about 1.25 seconds