Answer:
A. The large areas that united under one ruler were Byzantine Empire, Roman Empire, and China.
B. The rulers of dynasties, government, king, and emperor that united large areas under one rule was Justinian of the Byzantine Empire, Qin Shi Huang of China, and Vespasian Roman Emperor.
C. The strategies or practices rulers have used to unify diverse people in their empires under one rule which have the same laws and rules for people regardless what state they are in the location where they rule or control. Similar currency for everybody so you recognize precisely what something is valuable and you are unable to get cheated or cheat a person. Creating routes that join all aspects of the realm so that humans can get to one another and find out regarding each other.
Step-by-step explanation: