The correct answer is option 4, European Union.

BREXIT stands for "British Exit" and refers to the process by which the United Kingdom (UK) left the European Union (EU). The EU is a political and economic union composed of 27 European countries, aimed at promoting economic cooperation, free trade, and common policies among its member states. The UK joined the EU in 1973 but, after a referendum held in June 2016, the majority of British citizens voted in favor of leaving the EU.

Option 1, the International Monetary Fund (IMF), is an international organization that aims to foster global monetary cooperation, secure financial stability, facilitate international trade, promote high employment and sustainable economic growth. Brexit has no direct impact on the membership or involvement of the UK in the IMF.

Option 2, the Commonwealth, is an intergovernmental organization of 54 member countries, mainly former territories of the British Empire. While the UK leaving the EU does not impact its membership in the Commonwealth, the two are separate entities, and Brexit does not directly involve the Commonwealth.

Option 3, the World Trade Organization (WTO), is an international organization that establishes rules and agreements governing global trade. While Brexit will affect the trade relationships between the UK