How do mediums of exchange affect trade A. they make trade more efficient. B. They make trade more expensive. C.they make trade less global. D they make trade less profitable

A.they make trade more efficient.

Explanation:

An exchange medium may be described as an item or tender which is used to facilitate the process of exchange of goods and services between people, countries or any trading pair. It allows a buyer to offer something in return for an equal amount good and services received from the seller. In the past, several means of exchange has been used till date where a country's currency is now the means of exchange used to aid business transaction. The with a means of exchange, a more efficient trading experience is guaranteed as trading is conducted more easily and rapidly.

answer; /// i believe that the correct answer is (b)///they gained vast amounts of

these civilizations were located around fertile rivers, where they could produce an abundance of crops