From a diff, a ball was thrown downward at an initial velocity of 28 feet per second. The distance the ball had fallen is given by the function d (t) = 16t² + 28t, where t is the time elapsed in seconds. If the ball took 2 seconds to hit the ground below the cliff, how many seconds did the ball take to fall of the way to the ground?
A) 0.125
B) 0.5
C) 0.75
D) 1.0