You have been hired as a consultant to the central bank for a country that has for many years suffered from repeated currency crises and depends heavily on the U$.$S$.$ financial and product markets. Which of the following policies would have the greatest effectiveness for reducing currency volatility of the client country with the United States?

a$.$ an internationally floating exchange rate

b$.$ dollarization

c$.$ an exchange rate pegged to the U$.$S$.$ dollar

d$.$ an exchange rate with a fixed price per ounce of gold