each currency has a changing value relative to other currencies. this is referred to as a currencys \n○…

each currency has a changing value relative to other currencies. this is referred to as a currencys \n○ exchange rate\n○ currency value\n○ exchange value\n○ currency rate
Answer
Brief Explanations:
The exchange rate is the value of one currency in terms of another. It fluctuates over time. Currency value is a more general term for a currency's worth. Exchange value is not the standard term for this concept. Currency rate is not the correct term. The standard term for the changing value of a currency relative to others is exchange rate.
Answer:
A. exchange rate