Final answer:
The European Union is an economic union that promotes free trade, economic cooperation, and the mobility of goods, labor, and capital among its European member countries, and it created a common currency, the euro. Hence, the correct answer is option (A).
Step-by-step explanation:
The European Union (EU) is best described as a full economic union made up of multiple member countries in Europe. It began as a free trade association after World War II, evolved into a common market, and now serves as an economic union with the major goals of promoting free internal trade, economic cooperation, and the mobility of goods, labor, and capital.
A key milestone was the introduction of a common currency, the euro, although some member countries have chosen to retain their own currencies. The EU works to eliminate trade barriers and has adopted coordinated fiscal and monetary policies among its members.