Which of the following sentences best describes the role

of the United Nations in world affairs?
(1 point)
It ensures that everyone follows treaties.
It maintains trade relations and keeps trade
negotiations open.
It mediates conflicts and supports humanitarian
projects.
It provides a common defense against large
aggressive nations

The sentence "It mediates conflicts and supports humanitarian projects" best describes the role of the United Nations in world affairs.

The sentence that best describes the role of the United Nations in world affairs is "It mediates conflicts and supports humanitarian projects."

To determine the best sentence that describes the role of the United Nations in world affairs, we can analyze each option and see which one aligns with the organization's primary functions.

1. "It ensures that everyone follows treaties."
The United Nations does play a role in monitoring and enforcing international treaties. However, this statement does not fully capture the broader scope of the organization's responsibilities.

2. "It maintains trade relations and keeps trade negotiations open."
While the United Nations does promote international trade, this sentence focuses solely on economic aspects and overlooks other crucial areas the organization deals with.

3. "It mediates conflicts and supports humanitarian projects."
This option accurately reflects one of the primary roles of the United Nations. The organization frequently engages in conflict mediation and peacekeeping efforts, as well as supporting humanitarian projects around the world.

4. "It provides a common defense against large aggressive nations."
Although the United Nations has a Security Council responsible for maintaining international peace and security, this sentence implies a more active military role, which is not the primary function of the organization.

Based on the analysis, the sentence that best describes the role of the United Nations in world affairs is: "It mediates conflicts and supports humanitarian projects."