Which of the Following Statements Is True of the European

Which of the following statements is true of the European Union?

A) All issues have to be passed unanimously by the EU members to be enforced.
B) Every country in the European Union has adopted the euro as its monetary unit.
C) Custom duties have been removed among member nations of the European Union.
D) Custom tariffs have been removed for trade between the EU and the rest of the world.