How did the authorization of greenback bank notes affect the monetary system?

How did the authorization of greenback bank notes affect the monetary system?

a) It enabled a form of currency that could be used in both the North and

the South.

b) The declaration that greenbacks were legal tender enabled a solid

monetary system that outlasted the war.

c) It allowed for war profiteering at higher levels than ever before.

d) The authorization of greenbacks made the financial system more

unstable