Which of the following accounted for the largest component of Australia's major exports?

The largest component of Australia's major exports is iron ore. This is primarily due to Australia's abundant natural resources and its position as one of the world's top producers and exporters of iron ore. The mineral is in high demand, particularly from countries like China, which relies heavily on Australian iron ore for its steel manufacturing industry. The export of iron ore significantly contributes to Australia's economy, generating substantial revenues that help support jobs and infrastructure development.

While coal, education, and wool are also important export sectors for Australia, none match the volume and value of iron ore exports. Coal has seen fluctuating demand and prices, education is a significant service export but does not rival the bulk commodities typically counted in major export categories, and wool, while historically important, has a much smaller economic footprint today compared to iron ore.