The correct answer is D. Geneva.
The International Committee of the Red Cross (ICRC) is an independent, neutral organization whose exclusively humanitarian mission is to protect the lives and dignity of victims of armed conflict and other violence and to provide them with assistance. It was founded in 1863 by Henry Dunant.
The ICRC is headquartered in Geneva, Switzerland. The city is also home to the International Court of Justice, the United Nations Human Rights Council, and the World Trade Organization.
Vienna is the capital of Austria and the seat of the United Nations Office at Vienna. Paris is the capital of France and the seat of the Organisation for Economic Co-operation and Development. The Hague is the capital of the Netherlands and the seat of the International Court of Justice.