Scientists wanted to study the impact of different types of gas on the mileage of the Toyota Prius Hybrid using 10 cars. In Study 1, each Toyota Prius received a full tank of unleaded gasoline. The car then drove 100 miles on the highway at 55 mph The amount of remaining gasoline was measured. In Study 2, the experiment was repeated, but the cars were given premium gasoline instead of unleaded. The amount of remaining gasoline was measured. What is the dependent variable in this experiment?

The type of gasoline used

The distance driven on the highway

The amount of remaining gasoline.

The speed the car drove​