The correct answer is D. Shogun.
Step-by-step explanation
In Japan, the term Shogun was a title used to refer to the general who commanded the army sent to fight the Emishi, who lived in the north of the country. This title was important because during the 12th century he was the ruler of the entire country, even though the emperor was still the head of the government. Its government is known as Shogunate. Japan was under the rule of three Shogunates in its history that were in 1192 - Kamakura shogunate, 1338 - Ashikaga Takauji, and in 1603 - Tokugawa shogunate. After the fall of the Shogunate, feudalism was implanted in Japan, and the country was unified by the Meiji Emperor who came to restore it. So, the correct answer is Shogun.