Explanation:

- Option 1: 1991: The World Trade Organization (WTO) was not founded in 1991. During this time, the General Agreement on Tariffs and Trade (GATT) was still in effect.

- Option 2: 1993: The WTO was not founded in 1993. However, this was around the time when countries were negotiating the creation of the WTO during the Uruguay Round of Multilateral Trade Negotiations.

- Option 3: 1995: The World Trade Organization was officially established on January 1, 1995. It marked a major shift from GATT, which was a temporary framework, to a formal international organization.

- Option 4: 1996: By 1996, the WTO had already been in existence for a year, actively working towards facilitating international trade.