A) the Supreme Court binds all state and federal justices. They are the highest levels of courts in the us justice system.
Due to the deaths of most of the population, "ordinary farm workers, who had been forced into serfdom previously, shot up by 50%. More bullion among a smaller population meant more wealth across all classes and because the same land was in use and it was now plentiful, it resulted in technological advances as well." - Hank Campbell (found at Science20.com)
About a third of the clergy fell to the Black Death, making answer a. unlikely.
I never found any information stating Peasants migrated into cities for medical care, making answer b. unlikely.
Lower classes benefited from the Black Death economically, therefore c. is my final answer.
Doctors at this time knew nothing about how to cure disease, they also made little to none advancements. Answer d. is very wrong.
By working together voluntarily, the railroad companies were able to standardize their timetables in 1883. The correct option among all the options that are given in the question is the second option. The creation of time tables made the railway system more efficient and people could know the exact time at which their goods or the people travelling will reach their destination.
He skillfully defended his authorship of the Declaration of Independence document.
The three rules known for unifying Japan are Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu.