Under Article 253 of the Constitution of India, Parliament has POWER TO LEGISLATE on any subject (irrespective of Lists in Seventh Schedule) for the purpose of IMPLEMENTING:

1. Article 253 Constitution of India: 'Notwithstanding anything in the foregoing provisions of this Chapter, Parliament has power to make any law for the whole or any part of the territory of India for implementing any treaty, agreement or convention with any other country or countries or any decision made at any international conference, association or other body.' 2. This OVERRIDES the Lists in the Seventh Schedule — Parliament can legislate even on State List subjects to implement treaties (necessary for India's DUALIST approach to international law). 3. The Foreign Trade (Development and Regulation) Act 1992, Environment Protection Act 1986 (after Stockholm 1972), CEDAW-related laws all invoke Article 253. 4. The Supreme Court in Maganbhai Patel v. Union of India, AIR 1969 SC 783, recognised the executive's power to enter treaties but legislative implementation requires Parliament. 5. Hence option B is correct. _Source: UN Charter 1945 / Vienna Convention on Law of Treaties 1969 / ICJ Statute / ARSIWA 2001 — Constitution of India, Article 253_