The answer is D
the civil service system helps appoint government employees.
The dynasties both influence the silk road by their goods, spices and innovations . i hope this helps.
California Trail.
hoped it helped
Your Welcome
This would be a perfect example of the system of barter as you are trading one book for the other. You can see from here what barter is, a trading system which involves direct exchange of goods without some kind of medium of exchange, for example money. Services can also be traded this way.
