Answer;
Buddhism was introduced into Japan
Explanation;
Mahayana Buddhism was introduced to Japan from Korea in the sixth century, in either 538 or 552. This happened when a delegation sent by a Korean Prince arrived at the court of the Emperor of Japan, who brought with them Buddhist sutras, an image of the Buddha, and a letter from the prince praising dharma.
The other events came way after the introduction of Buddhism in Japan
Mongols took over Chinese rule in 1279
Tokugawa Shogunate began in 1600
The Koryu dynasty (aka Goryeo) began in 918
from the given question answer B is right
One way in which Americans developed a unique cultural identity after the Revolution was by ratifying the Constitution, which created a true "nation" as opposed to a lose confederation of states, which allowed people to develop a sense of nationalism and "pride" in their country.
To provide schooling and education