The graph shows how many bottles a machine caps in a certain number of seconds. alternative text part a what is the constant of proportionality, and what does it mean in this situation? use the drop-down menus to show and explain your answer. the constant of proportionality is ; the machine caps bottles in . part b which of the following is an ordered pair on the graph? what does it represent in this situation? a. (45, 90); the machine caps 45 bottles in 90 seconds. b. (45, 900); the machine caps 45 bottles in 900 seconds. c. (45, 900); the machine caps 900 bottles in 45 seconds. d. (900, 45); the machine caps 900 bottles in 45 seconds.