Feudalism was a popular societal structure in Europe during the Middle Ages (between the 9th and 15th centuries), which arose in response to the state of chaos which had befallen Western Europe for centuries after the fall of the Western Roman Empire in 476 C.E. In fear of raids on the lower class (which made up the majority of the European population at the time), the feudal system, a system of land ownership and duties, was developed. Based on the exchange of land for military service, it demanded that everyone owed allegiance to the king and their superiors. In other words, the nobles pledged their support to their king both financially and militarily in exchange for land and prestige. In turn, the nobles ensured their lands would be protected by promising knights (vassals), small portions of their land in exchange for fealty. This phenomenon was known as "fief" and was a big part of feudalism. Finally, the knights and vassals would allow peasants (serfs) to live on their lands in exchange for food and other services, thus completing what is often known as the feudal pyramid.
Hine's photographs in early 1900's transform a society. His photographs used to change child labor in United State. He documents the everyday life of child laborers and bears the difficult situation of every child to the public. Hine believed that if people see the mistreat and injustice they would desire law to end it. In 1904 the National Labor Committee was formed to end child labor.
The answer is B capital city.