The correct answer is (b).
The Concurrent List is a list of subjects that are both within the jurisdiction of the central government and the state governments. This means that both the central government and the state governments can make laws on these subjects.
The idea of the Concurrent List was borrowed from the Swiss Constitution. The Swiss Constitution has a similar list of subjects, which are called “concurrent powers”.
The other options are incorrect. The United States Constitution does not have a Concurrent List. The Australian Constitution has a list of subjects that are within the jurisdiction of the federal government, but it does not have a list of subjects that are within the jurisdiction of both the federal government and the state governments. The Soviet Constitution did not have a Concurrent List.