The answer to this would be B- Longitudinal Study.
Lowering bank reserve limits
In a fractional reserve banking system, as in the U.S. and the rest of the developed world, banks use deposits to create new loans. By regulation, they are only allowed to do so to the extent of the reserve limit. That limit is currently 10% in the U.S., meaning that for every $100 deposited with a bank, it can loan out $90 and keep $10 as reserves. Of that new $90, $81 can be turned into new loans and $9 kept as reserves, and so on, until the original deposit creates $1000 worth of new credit money: $100 / 0.10 multiplier.
Answer:
The plague or Black Death brought about a significant decline in feudalism. In 1348 The Black Death swept through the majority of Europe killing people in the millions. This massive tragedy resulted in the decline of Europe's labor and surf forces and in consequence, the income and wages for the peasant class increased substantially. The higher class naturally did not accept this which in return angered the lower class; thus, resulting in turmoil between both classes. The peasant class soon overcame the higher class effectively abolishing serfdom and feudalism in Europe as a whole.
The shifting of powers from lords to common people saw the decline of feudalism as well. The Hundred Years war brought about new ideas and inventions most notably the inventions of firearms, cannos, and gunpowder. These innovations in military technology made knights and castles seem less reliable. The war promoted feelings of pride and nationalism, the system shifted towards the people and loyalty to monarchs rather than to nobility.
In essence Feudal society as a whole fell due to advancements in technology and agriculture; and the effects of the bubonic plague.
