Concept:Feudalism is a system organised around land ownership and ranked social relationships.
Explanation:In a feudal society, land is the main source of wealth and power.
The king or monarch owns all the land and grants portions to nobles or lords.
These lords allow peasants or vassals to work on the land.
In return, the vassals provide services such as labour, military support, and loyalty.
This creates a clear hierarchy based on land ownership.
Therefore, the system described in the question is feudalism.
Answer:A. feudalism