Which of the following was the Japanese reasoning for imposing the policy of Sakoku for over two hundred years?

A). Shogun attempts to limit Daimyos power and increase the wealth of the Bakafu through taxes/levies
B). Japanese fears of Chinese invasion following a rapid increase in Chinese immigration in the 16th century
C). Emperor's fear that after the Tokugawa leyasu converted Christianity, Japan would be forced to convert.
D). Japanese attempts to stop all trade from outside of Japan to avoid foreign corruption