【单选题】A system of managed floating exchange rates is
A.
a system in which governments may attempt to moderate exchange rate movements without keeping exchange rates rigidly fixed.
B.
a system in which governments use flexible exchange rates.
C.
a system in which governments are forbidden from attempt to moderate exchange rate movements without keeping exchange rates rigidly fixed.
D.
a system in which governments need to reach a prior agreement among them before they may attempt to moderate exchange rate movements without keeping exchange rates rigidly fixed.
E.
a system in which governments use extensive fiscal policy to discourage exchange rate movements.