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In which situation did the car achieve the greatest efficiency? (Assume the cars all have the same mass.)(1 point)

a car that traveled 80 kilometers on 5.0 liters of gas

a car that traveled 90 kilometers on 6.0 liters of gas

a car that traveled 50 kilometers on 4.0 liters of gas

a car that traveled 70 kilometers on 5.0 liters of gas