The image shows a model of the gravitational field around earth. which best describes the model? a the field exerts an attractive force only outside of the ring of arrows that point toward earth’s surface. b the field exerts an attractive force only within the ring of arrows that point toward earth’s surface. c the strength of the field increases as you get farther from earth, as shown by the larger spaces between the circles. d the strength of the field increases as you get closer to earth, as shown by the smaller spaces between the circles.