How are the variables on the graph related? answer choices: a. as speed decreases, height stays constant. b. as speed decreases, height increases. c. as speed increases, height decreases. d. as speed increases, height increases.

Correct
"D. As speed increases, height increases."

The x-axis is the one that indicates speed. The y-axis is the one that indicates height. As points of the represented line on the graph get bigger as to their x coordinate, they also get bigger on their y cordinate. When x increases, y increases also. This shows that their is a proportional relation between both the speed and height.