Correct Answer: United Kingdom

Solution : The correct answer is the United Kingdom .

The United Kingdom held a referendum on June 23, 2016, in which voters were asked whether the country should remain a member of the European Union (EU) or leave the EU. This outcome led to the process commonly known as "Brexit," short for "British exit." Since then, the UK has been in a transition period, negotiating the terms of its departure from the EU, which officially ended on January 31, 2020.