How Did the Threat of Mongol Invasion Affect Japan

How did the threat of Mongol invasion affect Japan?

A) Japanese clans took political control of their regions.
B) Japanese merchants lost huge sums of money in the Mongolian markets.
C) Japanese monks were held hostage.
D) The Japanese military government spent a lot of time building coastal defenses, hoping to consolidate the warrior class.
E) Japan reinstated direct imperial rule.