The Headquarters of the 'Greenpeace International' is located at:

The correct answer is A) Amsterdam. Greenpeace International, the umbrella body of the global network, has its headquarters in Amsterdam, Netherlands. The movement began in 1971 in Vancouver, Canada, as the 'Don't Make a Wave' committee, and its international secretariat later shifted to Amsterdam. The Amsterdam location still holds, so this fact has not changed.

• Canberra (B) is the capital of Australia. Greenpeace Australia Pacific operates from Sydney, not from the national capital.
• Ottawa (C) is the capital of Canada. Greenpeace's Canadian presence is tied to its Vancouver origins and Toronto operations, not to Ottawa.
• Nagasaki (D) is a Japanese city known for the 1945 atomic bombing. Greenpeace Japan works from Tokyo, and Nagasaki has no link to the international headquarters.

The core concept here is the transnational NGO and how such bodies are structured as federations of national affiliates with a coordinating secretariat. For Mains, this connects to GS-II (role of non-state actors) and GS-III (environmental governance, pressure groups and climate advocacy).

Trap: Aspirants often pick the capital of the country where an NGO was founded, or the city of its national chapter. Always separate the origin, the national affiliates and the global secretariat.