Which of the following is an example of an intergovernmental organization (IGO)?

An intergovernmental organization (IGO) is defined as a formal entity created by multiple sovereign states to work together on common goals and issues, typically through treaties or agreements. The European Union is a prime example of an IGO because it comprises member states that collaborate on a wide array of legislative, economic, and social issues, ensuring shared policies and regulations across its member nations.

In contrast, the International Red Cross and Greenpeace are not IGOs; the former is a humanitarian organization that operates independently of state control, while the latter is a non-governmental organization concerned with environmental issues. McDonald's, a global fast-food corporation, functions solely as a business entity and does not represent any form of intergovernmental collaboration. Thus, the European Union stands out as the correct answer, embodying the characteristics and structure of an intergovernmental organization.