Final answer:
The role of the High Court in interpreting the Australian Constitution is to determine the meaning of the Constitution and decide the validity of laws made by the federal and state governments. Option A is correct.
Step-by-step explanation:
The role of the High Court in interpreting the Australian Constitution is (A) to determine the meaning of the Constitution and to decide whether laws made by the federal government and state governments are valid.
The High Court has the power of judicial review, which means it can examine laws and determine whether they are in line with the Constitution. This power allows the High Court to strike down laws that are found to be unconstitutional.