Justinian l's legal reforms were important primarily because: A. they limited the number of practicing lawyers.
B. they arranged Roman law and created a foundation for future legal
systems.
C. they helped the Byzantine Empire expand continuously for another
1,000 years.
D. they translated Roman law into Greek.

c holding free elections

"germany's geographic location was an advantage when it was on the offensive in the war because it was situated next to an extremely wide river, the rhine, which was difficult for the allies to cross."

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.