Question : What was a significant milestone in the development of the European Union?
Option 1: Creation of the euro currency
Option 2: Signing of the Schengen Agreement
Option 3: Brexit
Option 4: Formation of the European Coal and Steel Community
Correct Answer: Creation of the euro currency
Solution : A significant milestone in the development of the European Union was the creation of the euro currency, which is used by 19 of the 27 EU member states and serves as a symbol of economic integration.