The correct answer would be A: "the UN does many different things in the world. Other organizations are focused on more specific world problems."
The United Nations (UN) has a broad mandate and engages in various areas such as peace and security, humanitarian aid, human rights, social and economic development, and international law. In contrast, many other intergovernmental organizations (IGOs) may focus on specific sectors or issues, such as trade, health, or environment, making the UN's scope more comprehensive.
Option D is incorrect as the UN is an intergovernmental organization, not a non-governmental organization (NGO). The other options also don't accurately reflect the distinctive nature of the UN compared to other organizations.