Arrange the following events in a chronological order:

A) Euro, the new currency, was introduced in the 12 EU members.
B) The Lisbon Treaty came into force.
C) Bulgaria and Romania join the EU. Slovenia adopts the Euro.
D) Austria, Finland and Sweden join the EU.

Choose the correct answer from the given options:

D, A, C, B

The correct answer is Option 4- D, A, C, B

D) January 1995: Austria, Finland and Sweden join the EU.
A) January 2002: Euro, the new currency, was introduced in the 12 EU members.
C) January 2007: Bulgaria and Romania join the EU. Slovenia adopts the Euro.
B) December 2009: The Lisbon Treaty came into force.