Why does having highly flexible real wages help a country reduce the economic costs when joining a currency union?

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All of the reasons mentioned in these options are validReal wages decline quickly during a downturn, allowing the economy to return to its long-term equilibrium faster, thus shortening the recession even without exchange rate adjustmentsLaborers relocate from a country experiencing reduced aggregate demand to other member countries, keeping unemployment lower than it would be otherwiseA drop in real wages counteracts the inflationary pressures caused by replacing the old currency with the new shared currencyNone of the above explanations are accurate

Explanation

High real wage flexibility means wages adjust downward swiftly during recessions, enabling the economy to recover more quickly by restoring equilibrium without relying on exchange rate changes. This reduces the recession's length and severity, which lowers the overall cost of joining a currency union.