Explanation:

- The World Trade Organization (WTO) is an international body that regulates and facilitates international trade.

- Its main function is to ensure that trade flows as smoothly, predictably, and freely as possible.

- Option 1: Italy - Italy is a country known for its rich history and culture, but it is not the location of the WTO headquarters.

- Option 2: Geneva - The headquarters of the WTO is indeed located in Geneva, Switzerland. This city is a hub for numerous other international organizations as well.

- Option 3: New York - New York is home to the United Nations headquarters, but not the WTO.

- Option 4: Washington - Washington, D.C., is the capital of the United States, but it is not the location of the WTO headquarters.