Which car has the greatest efficiency?(1 point) Responses a 1,200 kg car that travels 20 km per liter of fuel a 1,200 kg car that travels 20 km per liter of fuel a 900 kg car that travels 15 km per liter of fuel a 900 kg car that travels 15 km per liter of fuel a 900 kg car that travels 20 km per liter of fuel a 900 kg car that travels 20 km per liter of fuel a 1,200 kg car that travels 15 km per liter of fuel