If a ball is accelerating downward through the air with no horizontal motion, the correct statement about the net forces acting on the ball is:
The gravitational force is greater than the drag.
This is because the ball is accelerating downwards, which indicates that the net force acting on it (the difference between the gravitational force and the drag force) is directed downward. For the ball to accelerate downwards, the gravitational force must be greater than the drag force.