The International Court of Justice, or ICJ, is the correct answer, as it is explicitly the principal judicial organ of the United Nations, established by the UN Charter and seated at the Peace Palace in The Hague, a fact stated directly by the ICJ itself on its official website. The ICJ settles legal disputes submitted to it by UN member states and gives advisory opinions on legal questions referred by authorised UN organs and agencies, making it central to interstate dispute resolution under international law. The International Criminal Court, option A, is the single most common wrong answer for this exact question, because it is also physically located in The Hague and its name sounds almost interchangeable with the ICJ, but the ICC is a separate, treaty-based institution created by the Rome Statute to prosecute individuals for war crimes, genocide, and crimes against humanity, and it is not a UN organ at all, only cooperating with the UN under a separate relationship agreement. The European Court of Human Rights, option C, is incorrect because it is a regional body of the Council of Europe headquartered in Strasbourg, France, not The Hague, and it is unconnected to the UN system entirely. The WTO Dispute Settlement Body, option D, handles trade disputes between World Trade Organization members and is based in Geneva, Switzerland, making it geographically and institutionally distinct from both The Hague and the UN's judicial structure. The classic exam confusion here is conflating the ICJ, which resolves disputes between states, with the ICC, which prosecutes individuals; remembering 'states go to the ICJ, individuals go to the ICC' resolves this reliably. Revision takeaway: The Hague hosts the ICJ as the UN's principal judicial organ, and separately, the non-UN ICC, a distinction worth memorising precisely.