I believe the answer is A) Japan's ruler did not allow them to conduct business anywhere else.
Just took the test and B) is wrong for sure.
Explanation:
the pf text book says: " Apart from the Dutch, who were allowed only on the small island of Deshima in Nagasaki, the only foreign trade was with the Koreans and Chinese."
I would assume the word "allowed" means that the Japanese ruler at the time only allowed them to do commerce there.
the higher class people were enjoying there life siting confterably while the lower class has to suffter all the hardships from the higher classes choices.