Both a and c are correct, however I think that A would be the most correct answer in this case.
Answer:
United States.
Explanation:
The United States was reluctant to join the war effort- congress specifically. Britain was left alone to fight Germany for most of the war. France was occupied by Nazis- so the most they could do was fight sporadic guerilla battles. The US finally joined the war after the bombing of Pearl Harbor.
The EUro has pros. Such as transparency, reducing cost of exchange, reducing cost of printing, the same and anticipated monetary policy in every member country etc.
