What is the importance of the european union (eu)?

The European Union (EU) is an economic and political federation consisting of twenty-seven member countries that make common policy in several areas. The EU was created in 1993 with the signing of the Treaty on European Union, commonly referred to as the Maastricht Treaty, but it was preceded by various European organizations that contributed to the development of the EU. The EU represents the latest and most successful in a series of efforts to unify Europe, including many attempts to achieve unity through force of arms, such as those seen in the campaigns of Napoleon Bonaparte and World War II. 

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Idont know which one is right   but i know that c is wrong and a might be wrong