*Worth a lot of points* I really need some help ASAP PLEASE Sasha noticed that the graph of the sales of yearbooks represented a proportional relationship. How could she have calculated the constant of proportionality by looking at the graph? A. She could divide any y-value by its corresponding x-value. B. She could divide any x-value by its corresponding y-value. C. She could add any y-value to its corresponding x-value. D. She could subtract any x-value from its corresponding y-value.