Lack of mineral resources has forced Japan to become a trading nation.
The "d. United Nations" would not be a good example of an NGO, since NGOs (non-governmental organizations) usually act independently and on a much smaller scale.
There is no no mutilple choice
The United States prospered greatly because of high demand for goods and services. They also benefited from lack of damge from the war. The Marshal Plan and Social Welfare Programs were a benefit for the Western European countries. Japan highly benefited from strong export sales and strong American support.