Explain why when Norway unilaterally fixes its exchange rate against the euro but leaves the krone free to float against the non-euro currencies, it is unable to keep at least some monetary independence

What will be an ideal response?

Any independent money supply change in Norway would put pressure on krone interest rates and thus on the krone/euro exchange rate. So by pegging the krone even to a single foreign currency, Norway completely surrenders its domestic monetary control.