The Amount of Gasoline Used by Each Person Generally Increases

The amount of gasoline used by each person generally increases with per capita land consumption. However, this graph shows that gasoline consumption is much lower in Australia than in the United States. Why is this the case?

A) Australia is located in the Southern Hemisphere.
B) Australia is a smaller country.
C) Australia has fewer major cities.
D) Australia has better public transportation.
E) Australia has a better road system.