A nutritionist collects data from 25 popular breakfast cereals. For each cereal, the number of calories per serving is plotted on the x-axis against the number of milligrams of sodium on the y-axis. The value of r for the resulting scatterplot is 0.83. How would the value of the correlation coefficient, r, change if sodium was plotted on the x-axis and calories plotted on the y-axis? a. The value of r would increase.

b. The value of r would not change.

c. The value of r would change to -0.83.

d. The value of r could increase or decrease, depending of the strength of the new relationship.