Which of these descriptions best matches feudalism?

a society based on long-lasting and recurring feuds between sections of society

a social structure where the administrative powers lay with the military authorities

a tiered social structure where members of the lower class served those of the tier above

a social structure where the administrative powers rested with the clergy

The correct answer is C. A tiered social structure where members of the lower class served those of the tier above

Explanation:

The Feudalism was the predominant social and political system during the Middle Ages. This was a tiered or hierarchical fixed system based on power and land, in this way the King was at the top of the hierarchy and this was followed by the Lords, then the Knits and finally the Peasants and Serfs. Additionally, there were fixed relationships in each level, for example, the serfs or peasants were the ones that farmed the land in exchange of protection form Knights and Vassals, which means those in lower classes served upper classes in exchange of some benefits. According to this, the statement that best describes feudalism is "A tiered social structure where members of the lower class served those of the tier above".

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.