In which year, the referendum to leave the European Union took place in Great Britain ?

Correct option is C

The referendum in which the United Kingdom voted to leave the European Union (commonly referred to as "Brexit") took place on June 23, 2016. The majority of voters (51.9%) chose to leave the EU, leading to a series of political and economic events that shaped the UK’s withdrawal from the EU.

Information Booster : 

The Brexit referendum was a highly divisive issue in the UK, leading to intense debate about sovereignty, immigration, and economic effects.

David Cameron, the then-Prime Minister, resigned after the referendum result, as he had campaigned for the UK to remain in the EU.

The official withdrawal of the UK from the European Union, known as Brexit, occurred on January 31, 2020, after years of negotiations and political wrangling.