Answer:
D. the amount of rice they produced
Explanation:
- The feudal system in Japan emerged during the 12th century. During this period, wealth land owners' social power was based on the amount of rice they could produce in a year.
- The wealth of the landowners were measured in terms of Koku which was equivalent to approximately 180 meters. Thus, social position of the landowners was measured according to the number of Kukos of rice they produced each year.
