The headquarters of Amnesty International is located in:

Amnesty International is a prominent global non-governmental organization dedicated to human rights. Its international secretariat, which serves as its central coordinating body, is strategically located in London, United Kingdom. This location facilitates its global advocacy efforts and coordination with various national sections worldwide. Option A is correct because London has been its headquarters since its inception. New York (B) is often associated with the United Nations, while Geneva (C) hosts numerous international organizations like the UN Human Rights Council and the World Health Organization. Washington (D) is the capital of the United States, home to many political and non-governmental organizations, but not Amnesty International's primary global headquarters. These cities are significant international hubs but do not house Amnesty's main office.