[单选题]The word of ‘fluctuation’ can be understood as ___.
AupwarD.downwarD.movements in thE.
economi
Bsystemb.thE.act oF.payinG.A.bill, debt, charge,
etc.c.thE.pricE.at whicH.onE.currency can bE.
exchange
Cfor another currencyd.to keep fixeD.or unchanged
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