Which was NOT a reason for the decline of the Heian dynasty in Japan?
a. Corruption in the imperial bureaucracy let to feudal fragmentation.
b. A shogun was installed as military governor over the emperor.
c. The equal-field system gradually fell into disuse in Japan.
d. Elite clans amassed most of Japan's lands into vast estates.
It would be that the "The equal-field system gradually fell into disuse in Japan," that was not a reason for the decline of the Heian dynasty in Japan, since this system remained somewhat intact.
