When Was the World Trade Organization Established, and What Was

When was the World Trade Organization established, and what was its purpose?  

A)  in 1995, to became the institutionalized and more comprehensive successor to the General Agreement on Tariffs and Trade 
B)  in 1947, to reduce trade restrictions among 23 member countries 
C)  in 1980, to oppose and counteract the policies of the General Agreement on Tariffs and Trade 
D)  in 2000, to meet in different countries every few years to analyze each country's trade policies and restrictions