What is the population density of Australia?

The population density of Australia is correctly identified as approximately 3 people per square kilometer. This figure reflects the country's vast land area combined with a relatively small population, making it one of the least densely populated countries in the world. The low population density can be attributed to Australia's geographic characteristics, including large deserts and arid regions that are inhospitable for large populations, as well as a significant concentration of people in coastal cities.

In contrast, the other options reflect higher population densities that do not accurately represent the demographic data for Australia. For example, a figure of 5, 10, or 15 people per square kilometer would suggest a much more densely populated country, which does not take into account the vast rural areas where few people reside. Thus, the choice of 3 people per square kilometer aligns well with the true demographic and geographic characteristics of Australia.