Correct Answer: Option D
The euro is the single currency shared by 19 of the European Union's Member States, which together make up the euro area. The introduction of the euro in 1999 was a major step in European integration. It has also been one of its major successes: more than 337.5 million EU citizens in 19 countries now use it as their currency and enjoy its benefits. In 2015 Lithunina adopted Euro as 19th country.
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