Question 4 (2 points) (01.05) Which of the following is the most appropriate unit to describe the rate of the cost of gasoline? (2 points) Оа Dollars per gallon, because the dependent quantity is the gallons Ob Dollars per gallon, because the dependent quantity is the dollars Ос d Gallons per dollar, because the dependent quantity is the gallons Gallons per dollar, because the dependent quantity is the dollars