Independent variable is a variable that does not change when circumstances change.
Dependent variable is a variable that changes when circumstances change. Usually dependent on the changes that occurs in the independent variable.
1) Number of pizzas Horton delivers - D.) INDEPENDENT VARIABLE
2) The vehicle Horton Uses - A.) BOTH THE INDEPENDENT VARIABLE AND THE DEPENDENT VARIABLE
3) The amount of money Horton makes - B.) DEPENDENT VARIABLE
4) The number of miles Horton drives during deliveries. - C.) NEITHER THE INDEPENDENT NOR THE DEPENDENT VARIABLE