The correct answer is D.
Explanation
The United Nations is an international organization intended to promote cooperation on global issues, including economic and social development that can support international trade — so option D best fits.
Why the others are wrong:
- A: The UN is funded by assessed contributions (mandatory) and voluntary contributions from member states and donors — not only voluntary dues.
- B: The UN does not have broad, unilateral authority to enforce international law; enforcement usually depends on member states or Security Council actions.
- C: The UN has no standing military; peacekeeping forces are contributed by member countries, so it does not have the “most powerful military.”