Which of the Following Is a Drawback to Having a Common

Which of the following is a drawback to having a common currency across countries, as in the European Union?

A) A common currency increases barriers to trade across countries, reducing opportunities for economic growth.
B) With a common currency, individual countries are no longer able to run independent monetary policies.
C) Having a common currency implies that the prices of goods across countries must always be the same, regardless of consumer preferences for goods across countries.
D) Having a common currency allows for coordinated monetary policy.
E) None of the above is a drawback to a common currency.