Which of the following did ming emperors restore to china? -confucian methods of governance -buddhist principles of nonviolence -european openness to commerce -mongol system of military training

The thing that he did was Confucian methods of governance
The confucian methods of governance balanced the legalism aspect of the governance with the social responsibility aspect of the governance.
With this method, the nation could give strong protection from possible threat while providing helps for people's development at the same time.

The answer is crop yield.