Answer:
C. The Tokugawa Shoguns closed the country's borders which permitted its own unique culture to develop.
Explanation:
What is Shogun? In ancient Japan, a Shogun is a military post with wide powers. A Shogunate, in this way, is a government ruled by the shoguns. This post can only be given by the Emperor. Japan in the 15th and 16th centuries witnessed a long period of wars, which destabilizes the central power. In several aspects, Japan couldn't be considered a united nation, once each province was ruled by a daimyo (feudal lord), and the order was maintained by his samurais. After the fall of the Ashikaga Shogunate, the fight for the power increased. After a bloody battle, Ieyasu Tokugawa created a new shogunate, this time stronger and centralized than the previous. Once in power, he witnesses the crescent influence of foreign cultures and religions, especially the Portuguese who were in Japan for almost 50 years. The constant attempt of religious conversion and economic/cultural interference led Tokugawa expells the foreigns (except some dutch), and close the Japanese borders. This period, also know as the Edo Period, is characterized as a moment when Japan did not accept any foreign influence and developed its culture, based on the traditions.
