Based on this passage, what was one way the Tokugawa shogunate 1 point affected Japanese society?

The Edo period followed many years of political and social upheaval. The previous division of Japanese history known as the Sengoku period (warring states period) was dominated by wars fought between various political and religious factions for the control of the country. These wars came to an end with the unification of Japan by the great generals Oda Nobunaga and Toyotomi Hideyoshi and eventually Tokugawa Ieyasu who formed Japan's final Shogunate.
Ieyasu consolidated his power through a series of social changes including the introduction of a strict class system and the tight control of the ruling daimyo families from the capital city Edo. Individuals had no legal rights and the family became very important at all social levels.
Source: Hokusai online

A. They unified Japan.
B. They promoted trade.
C. They modernized industry.
D. They eliminated social classes.