What is a significant challenge faced by monetary policy within a currency union?

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Controlling the money supply becomes more challenging in a currency union.The relationship between inflation and unemployment becomes less stable in a currency union.Every listed issue represents a difficulty for monetary policy in a currency union.Interest rates may be unsuitable for some countries, being too high for some and too low for others, since monetary policy must apply uniformly.

Explanation

One major issue with monetary policy in a currency union is that managing the money supply is more complicated due to the shared currency. Additionally, the inflation-unemployment relationship can become less predictable, and uniform interest rates may not fit all member countries' economic needs. However, the primary challenge highlighted here is the difficulty in controlling the money supply.