The so-called eurozone refers to

A) all members of the European Union.
B) the EU nations that have adopted a common currency.
C) the combined Eastern and Western Europe.
D) nations in Europe where the U.S. has military bases.

Eurozone

A monetary and economic union of 19 European Union countries that have adopted the euro as their common currency.

European Union

A political and economic union of 27 European countries that are located primarily in Europe, aiming to foster economic cooperation and create a barrier-free single market.

Common Currency

A common currency is a currency that is used by multiple countries, facilitating trade and economic policy coordination.