What factor contributed to the success of the tokugawa shogunate's afforestation efforts?

The Tokugawa shogunate was the third and last shogunate to hold power throughout Japan. During the period of the shogunatos, existed a species of military dictatorship submitted specifically to the emperor of Japan. The shogun, who became the general commander of the armed forces of Japan, had the military and political power of the country; while the emperor was assigned spiritual and religious power, as a link between people and gods, and nominal power in the Imperial Court of Kyoto. Therefore we can say that the success was due to the strong central government that this emperor exercised on all areas of society.

the answer is b for brother