I need help on c and d

c)

In a feudal system, a peasant or worker known as a vassal received a piece of land in return for serving a lord or king, especially during times of war. Vassals were expected to perform various duties in exchange for their own fiefs, or areas of land.

D)

Feudalism's environmental degradation pivoted on the lord-peasant relationship, which limited the possibilities for reinvestment in the land. Consequently, feudalism exhausted the soil and the labor power from which it derived revenues, rendering the population vulnerable to disease.

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.