Which of the following is a right protected under the Australian Constitution?

The right to free interstate trade and commerce is enshrined in Section 92 of the Australian Constitution, which states that "trade, commerce, and intercourse among the States shall be absolutely free." This constitutional provision protects the right of individuals and businesses to engage in trade and commerce across state borders without undue restrictions or burdens imposed by individual states.

This protection is crucial within the framework of Australia's federal system, as it promotes a national economy and facilitates movement and economic cooperation between the states. It reflects the underlying principle of fostering unity and economic collaboration among Australia's diverse regions.

The other options do not represent rights that are explicitly protected by the Constitution. For instance, the right to vote in local elections, public education, and the right to a fair trial, while important legal principles and rights, are governed by legislation and state laws rather than being directly enshrined in the Constitution.