Answer : The "force of gravity," the attraction between the Earth and the softball, is causing the ball to accelerate downwards.
(the attraction between the Earth and the softball; is causing; the ball to accelerate downwards) Context(the attraction between the Earth and the softball is causing,List([33, 94))):(the ball; to accelerate; downwards)
the attraction between the Earth and the softball is causing,List([33, 94))
the attraction between the Earth and the softball the ball
is causing to accelerate
the ball to accelerate downwards
downwards