Esther is participating in a walk-a-ton. She will raise 5 dollars for her charity for each lap she walks.

Let l = the number of laps she walks

Let d = the number of dollars she raises

A. independent variable = number of dollars; dependent variable = number of laps
B. independent variable = number of charities; dependent variable = number of people
C. independent variable = number of dollars; dependent variable = number of people
D. independent variable = number of laps; dependent variable = number of dollars