the black death was B) a disease that killed millions of europeans during the 14th century.
in the 14th century there were some fleas or something that hopped onto some rats and gave them a disease known as the bubonic plague aka the black death and the rats basically went out and broke into peoples houses and ate their food and infected the people.
Sejong is best known for inventing the Korean script, hangul, which is
much easier to learn than Chinese characters. He sponsored the invention of the rain gauge and sundial.
A historian compares the events by period since he compares them by time period
The answer would be,
B. Create agencies with the authority to protect those rights
Hope I helped!