A Currency Union Would Be Beneficial to Nations with Symmetrical

A currency union would be beneficial to nations with symmetrical demand shocks so that a coordinated monetary policy is possible. Comparing the Eurozone with the United States, the finding is:

A) the Eurozone nations and the U.S. states are markedly different in the correlation between growth rates of GDP.
B) the Eurozone nations and the U.S. states are quite similar in terms of correlation between growth rates of GDP.
C) the Eurozone nations have higher growth rates of GDP in their member states, whereas the United States exhibits lower growth rates.
D) the Eurozone is much more diverse in terms of its growth in GDP.