A competitive diver dives from a platform into the water. The graph shown gives the height above the water , in meters, of the diver seconds after diving from the platform. The graph of the diver's height over time is a parabola. Which physical principle best explains why the diver's height follows a parabolic path?

The diver's initial velocity is constant.
The force of air resistance is negligible.
The acceleration due to gravity is constant.
The diver's mass remains constant during the dive.