What was the most important change that Taizong made to build the Tang dynasty? Answers in the picture

Explanation:

To assure his armies ability to gain control of the north, Taizong increased the size of horse herds. When his father, Emperor Gaozu became emperor there were only 5,000 horses available to the military. During the Tang dynasty, the herds were increased to over 700,000 horses.

answer; the correct answer is (ethics);

c. wright mills's sociological imagination suggest investigating to explain this increase?