The office of International Court of Justice is situated in

Concept: The International Court of Justice (ICJ) is the principal judicial organ of the United Nations under Article 92 of the UN Charter, and it functions under its own annexed Statute. Unlike the UN's political organs, the Court's seat is a fixed location set out in that Statute, not wherever the General Assembly or Secretariat happens to meet.

Application: Article 22 of the Statute of the ICJ designates The Hague, Netherlands as the Court's seat. The Court has sat at the Peace Palace there since it began functioning in 1946, succeeding the Permanent Court of International Justice, which also sat at the same building.

Cross-check: Comparing where each major UN organ is actually seated confirms the pattern — the Court alone sits at The Hague while the other organs listed as options here are seats of different bodies entirely:

None of the other three cities house the Court under its Statute, which independently confirms the keyed option.