What Concern Did Many Economists Have About the Euro

What concern did many economists have about the euro?

A) The euro's weakness against the U.S.dollar would result in a recession throughout Europe.
B) Elimination of individual currencies would constitute an unprecedented loss of culture and history.
C) A single currency would be more prone to devaluation and manipulation.
D) Standardized monetary policies would be incompatible with the varied political and economic systems of EU states.
E) The cost of designing and printing the new currency would be greater than any possible economic benefit.