Which of the following statements about the euro is true?
A) It was adopted by all existing EU members when it was first initiated.
B) It must be adopted by countries as a precondition to joining the EU.
C) It cannot be used by countries that are not members of the EU.
D) It was designed to eliminate currency as a barrier to trade in the EU.
Answer: D) It was designed to eliminate currency as a barrier to trade in the EU.
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