Explanation:

WTO is not responsible of the improvement in the Balance of Payment of the member countries while other options given in the question are objectives of the WTO.
The important objectives of WTO are:
1. To improve the standard of living of people in the member countries.
2. To ensure full employment and broad increase in effective demand.
3. To enlarge production and trade of goods.
4. To increase the trade of services.
5. To ensure optimum utilization of world resources.
6. To protect the environment.
7. To accept the concept of sustainable development.