Answer:
D. The Qin tried to reunify China.
Step-by-step explanation:
The Qin's endeavour to reunify China triggered the Warring States period in ancient China. The central authority of the Zhou dynasty waned, allowing provincial governments to exert sovereignty and autonomy. The Qin dynasty waged military campaigns to conquer and unify other states, led by powerful rulers such as Duke Xiao and Duke Mu. The Qin state's aggressive expansionist policies undermined other states, producing further instability and strife. The Warring States period lasted 250 years, until Qin triumphed, uniting China and founding the Qin dynasty, ushering in the imperial era.