Ineed asap

kimberley wants to plot a graph to show the prices of different numbers of skateboards. she has to plot the following points:

(1, 49.99), (2, 99.98), (3, 149.97), (4, 199.96)

which of the following best describes how the x-axis should be labeled?

kate's total points for the season.
ella's total points for the season.
the number of games that ella played.
kate's points per game.