Under the member countries of the european union agreed to adopt a common european currency called the euro.

Under the "Maastricht Treaty", member countries of the european union agreed to adopt a common european currency called the euro.

The Maastricht Treaty, referred to formally as the Treaty on European Union, is the global assention in charge of the production of the European Union (EU).  

The Maastricht Treaty was endorsed by heads of administration of the states making up the European Community (EC) in December 1991. The bargain required voters in every nation to support the European Union, which ended up being a fervently discussed subject in numerous zones. The understanding took finished with the making of the European Union and has since been altered by different arrangements.

answer; (c) canada,mexico and the united states. i do believe this is the correct answer; /// good luck

d) social security number

let me know if i am correct or not, so i can edit the answer.