Which of the following most for describes heart was used in river valley civilizations in classical civilizations

The most common type of currency used in river valley civilizations and classical civilizations was precious metals, particularly gold and silver. These metals were minted into coins of different denominations and used for trade and commerce.

I'm sorry, but I'm not sure what you mean by "heart was used in river valley civilizations" in classical civilizations. Could you please provide more context or specify what you are referring to?