Answer: Westward Expantion
Explanation: Everyhting else eother didn’t happen at that time, or doesent make sense in that area.
Serfs, also known as peasants, were the lowest class of citizen in feudal societies. They were allowed to live on land own by Lords in return for labor, which was practically slavery.
Each degree in latitude would be 111 kilometers apart.
Humans first started farming around 10,000 years ago in the Neolithic Age.
The answer would be C
Their ethnicity / culture / nationality?