The World Trade Organization (WTO) came into effect on January 1, 1995. It is the successor to the General Agreement on Tariffs and Trade (GATT), which was established in 1947. The WTO is an international organization that deals with the rules of trade between nations. It aims to promote free trade and to help countries negotiate trade agreements. The WTO has 164 member countries, and its headquarters are in Geneva, Switzerland.
Option A is incorrect because the WTO did not come into effect in 1990. The WTO was established in 1995, and it came into effect on January 1, 1995.
Option B is incorrect because the WTO did not come into effect in 1993. The WTO was established in 1995, and it came into effect on January 1, 1995.
Option C is the correct answer because the WTO came into effect on January 1, 1995.
Option D is incorrect because the WTO did not come into effect in 1997. The WTO was established in 1995, and it came into effect on January 1, 1995.