The correct option is A Maastricht Treaty
The Maastricht Treaty (officially called the Treaty of the European Union) was signed on February 7, 1992 and entered into force on November 1, 1993. The treaty established a European Union (EU), with EU citizenship granted to every person who was a citizen of a member state. EU citizenship enabled people to vote and run for office in local and European Parliament elections in the EU country in which they lived, regardless of their nationality.