Answer:
The answer with detailed explanation are as given below in the explanation section
Step-by-step explanation:
a. Any quantity that is used to exchange goods and services in different form is known as medium of exchange. In the passage medium of exchange is Roman coins.
b. Romans coins could have provided the German tribes with a medium of exchange, with this author mean that German tribes could have used Roman coins in exchange of goods and services they need.
c. The willingness to except the roman coins from one of the German tribe member to other is that they need a medium of exchange for goods and services and they had not produced their own coins.