Which best describes the Tokugawa shogunate and its policies?

Aa dynasty established by Ieyasu after he defeated his rivals that increased trade with foreign nations to enhance cultural exchange

Ba dynasty established by samurai that sought to limit trade with foreign nations in order to boost the economy and create national unity

Ca dynasty created when Ieyasu united Japan, and that later closed off trade to limit western influence on Japanese culture

Da dynasty created after the shogun defeated Kublai Khan that greatly limited international trade