Knights were indeed lower than vassals and held less prestige in medieval society. It's not true though, that knights didn't have enough prestige in medieval society. Vassals swore to the king or the ruler of a region, whereas knights often swore to vassals, so they still had people under them, but they were not at the top.
The time frame is slightly important. Though for the most part that is false. The Chinese leaders did not see the need to interact with outside societies as they had little reason to trade.
b. False
Increased number of women working in industries
This implied the sudden weakening of the traditional family hence less children which resulted to decreased population in the northern cities whose lifeline was industries and pay job as source of income. more and more women bore less children.
