Explanation:

- Option 1: East Australia

- Australia generally has a low population density, as it has vast areas of uninhabited land.

- Option 2: North America

- North America has large urban centers, but vast expanses of sparsely populated areas contribute to a lower overall population density.

- Option 3: East Africa

- While East Africa has some densely populated regions, it has huge rural areas with lower density.

- Option 4: South Central Asia

- South Central Asia, which includes countries like India and Bangladesh, is known for having very high population densities, especially in urban regions.