Correct Option
Under Article 253 of the Indian Constitution, Parliament possesses the exclusive power to enact laws for the entire territory of India or any part thereof, specifically for the purpose of implementing any international treaty, agreement, or convention. This legislative power extends even to subjects enumerated in the State List, and it does not necessitate the consent of any state or states for its exercise. This provision ensures that India can fulfill its international obligations effectively without requiring state approval.
Incorrect Options
Options (a), (b), and (c) are incorrect. Article 253 explicitly grants Parliament the authority to legislate for implementing international treaties without requiring the consent of all states, a majority of states, or even the states concerned. The constitutional framework empowers the Union Parliament to act unilaterally in this regard to uphold India's commitments on the global stage, thereby making any requirement for state consent invalid.