The withdrawal of United Kingdom from the European Union is referred to more commonly as:

Correct option is D

The correct answer is option (D) Brexit

• Brexit is the term commonly used to refer to the withdrawal of the United Kingdom (UK) from the European Union (EU).
• The word "Brexit" is a combination of Britain and exit, and it gained widespread usage after the UK held a referendum on June 23, 2016, in which a majority of voters chose to leave the EU.
• The formal process of leaving was completed on January 31, 2020.
  

Information Booster :-

• The European Union (EU) is a political and economic union of 27 European countries that are located primarily in Europe.
• The EU was established to foster economic cooperation, political stability, and social progress among its member states, with the aim of preventing further conflicts in Europe after the devastation of the World Wars.