Answer: It would be C; but the option choice B is close considering its the law of the land. But C would be correct.
The only Europeans that were allowed to trade with the Japanese following the expulsion of all christians were the Dutch.
During the Sakoku, the isolationist foreign policy of the Tokugawa shogunate, the only contact with european influence allowed was with the Dutch who had a factory at Dejima in Nagasaki, and through the Dutch East India Company who was allowed to operate in Nagasaki.
China was surrounded to the west by mountains and deserts. These geographical features kept China isolated from the rest of the world, allowing its civilization to flourish in isolation from Europe and the rest of the world until the development of the Silk Road.
