Which situation describes the mileage of a car as 40 miles per gallon of gasoline?  A. A car can travel 2 miles on 80 gallons of gasoline.  B. A car can travel 42 miles on 2 gallons of gasoline.  C. A car can travel 80 miles on 2 gallons of gasoline.  D. A car can travel 80 miles on 40 gallons of gasoline.