The best answer to the question "What is a country's currency?" is:
C. the coins and paper money it issues
Explanation:
1. A country's currency refers to the physical money in the form of coins and paper bills that are issued by the country's central bank or government.
2. Currency serves as a medium of exchange for goods and services within the country's economy.
3. Each country has its own currency with specific denominations and designs that are used in daily transactions.
In this context, the correct choice is C as it directly relates to the definition of a country's currency as coins and paper money issued by the country.
