With a Common Currency Such as the Euro

With a common currency such as the euro,

A) trade barriers between countries using the currency are increased.
B) individual countries using the currency are no longer able to run independent monetary policies.
C) the prices of goods across countries using the currency must always be the same, regardless of consumer preferences for goods across countries.
D) individual countries using the currency are no longer able to run independent fiscal policies.
E) individual countries using the currency are no longer able to run independent immigration policies.