Countries who resisted Mastricht Treaty and adoption of European Currency:

Denmark and Sweden

The correct answer is Option (3) → Denmark and Sweden

Denmark and Sweden have not accepted the Euro as the common currency in the EU.

Euro is the currency used as legal tender among the member countries of European Union. It was introduced in  the 12 EU members in January 2002. Members of the European Union who have adopted the Euro currency are called the Eurozone. However, one can't ignore that there is also a deep-seated ‘Euro-skepticism’ in some parts of Europe about the EU’s integrationist agenda. Thus, for example, Britain’s former prime minister, Margaret Thatcher, kept the UK out of the European Market. Denmark and Sweden have resisted the Maastricht Treaty and the adoption of the euro, the common European currency.