I believe Jhevon gave an incorrect answer for B) and also gave an incorrect answer for C) due to the same flaw.

The equation

is valid

*only* for the diver's height for the time period that the diver is in the air. So it is true only from t = 0 s to t = 2s (when the diver hits the water.) So the domain of the function is [0, 2].

As to the range of the function, again the function is only defined for when the diver is in the air. So the range will include only 0 ft (the surface of the water) to whatever the maximum height is.

-Dan