Which country has the lowest arithmetic population density?

The country with the lowest arithmetic population density among the given options is Australia. Arithmetic population density is determined by dividing a country's total population by its total land area, which gives an average number of people per square kilometer.

Australia is known for its vast land area with a relatively small population compared to that area. Much of the continent is sparsely populated due to its arid climate and large expanses of desert, leading to a low overall population density.

In contrast, countries like the United States, Canada, and Brazil have larger populations relative to their land areas, resulting in higher population densities. The United States, for example, has major urban centers that contribute to a higher density, while Canada, despite its large land area, has regions with significant population concentrations. Brazil has a large population concentrated in urban areas, which also raises its arithmetic population density compared to Australia.