The answer is C, preserving the Union. Lincoln famously said, "If I could preserve the Union without freeing a single slave, I would."
Under Tokugawa Edo became the center of power in Japan. Daimyo lost a lot of their power. Japan became more unified and withdrawn from the world in a long period of isolationism.
<span>The Shogunate took control of Japan and led the military and the Emperor lost power. </span>
<span>A strict class hierarchy was created Samurai were at the top of the chain, Farmers, Merchants (at the bottom of the chain), and Crafts People. Only Samurai were allowed to carry swords</span>
The correct answer to this open question is the following.
The changes to Chinese administration and bureaucracy that Song rulers introduced were the following.
The Song dynasty produced changes in ancient China. Its leaders were committed to work and develop notorious advancements such as the use of the compass for exploration, the use of gunpowder to wage war and other uses such as construction, and invested so much in the formation of its standing navy, culture, arts, education, literature, and philosophical studies. Confucianism had a second "fresh air" with the studies of philosophers such as Zhu Xi and Cheng Yi.
Bureaucracy was centralized under the Song dynasty and demanded its bureaucratic officials to work with virtue and high moral. Indeed, they had to pass difficult examinations and evaluations to be part of the Song bureaucratic system of government.
The Song dynasty started in 960 and ended in 1279.
By banning people from visiting Palastine. I think that's the answer.