Explanation:

- Correct Answer: Option 4 - World Economic Forum

- Option 1: United Nations

- The United Nations (UN) is an international organization established to foster international cooperation and maintain global order. While it publishes numerous reports and indices on gender equality and human rights, it does not publish the Global Gender Gap Index.

- Option 2: IMF

- The International Monetary Fund (IMF) primarily focuses on global financial stability, economic growth, and monetary cooperation. It does not publish the Global Gender Gap Index.

- Option 3: World Bank

- The World Bank provides financial and technical assistance for developing countries and publishes reports on various development indicators but is not responsible for the Global Gender Gap Index.

- Option 4: World Economic Forum

- The World Economic Forum (WEF) is a Swiss-based organization known for its annual meeting in Davos and for publishing the Global Gender Gap Index, which assesses the state of gender equality worldwide.