Inter-State quarantine falls under the purview of the Union List (List I) in the Seventh Schedule of the Indian Constitution. This is because matters of inter-state significance, especially those related to health and disease control, are best handled by the central government to ensure uniformity and prevent the spread of diseases across state borders. _Let's examine why the other options are incorrect:_ *  Option A is incorrect: Inter-State trade and commerce is explicitly mentioned in the Union List (List I), giving the central government the power to regulate commerce that transcends state boundaries. * Option B is incorrect While individual states have some powers related to internal migration, Inter state migration is mentioned in the Union List. * Option D is incorrect Corporation tax, levied on the net income of companies, is a subject under the Union List. However, the Constitution allows for the sharing of corporation tax revenue with states.