What Is the Purpose of the General Agreement on Tariffs

What is the purpose of the General Agreement on Tariffs and Trade (GATT) ?

A) To devalue currencies and limit cross-border movement of funds.
B) To overcome shortages of private capital to make loans for rebuilding war-torn nations.
C) To raise the cost of imports,making them less competitive with similar domestic goods.
D) To expand trade by eliminating discriminatory barriers.