The correct option is A Maastricht Treaty
The Treaties of the European Union are a set of international treaties between the European Union (EU) member states which sets out the EU's constitutional basis. Two core functional treaties, the Treaty on European Union (originally signed in Maastricht in 1992) also called as the Maastricht Treaty and the Treaty on the Functioning of the European Union (originally signed in Rome in 1957 as the Treaty establishing the European Economic Community), lay out how the EU operates, and there are a number of satellite treaties which are interconnected with them. The treaties have been repeatedly amended by other treaties over the 65 years since they were first signed. The consolidated version of the two core treaties is regularly published by the European Commission.