The factors that has been responsible for the decline of the Ming dynasty has been started with the ineffective emperors. Thus, option B is correct.
The Ming dynasty has ruled China from the period of 1368 -1644 A.D. During the rule of the Ming Dynasty the population of China has been doubled that requires the extensive rules and regulations.
The cooperation of Ming General Wu Sangui with Manchus results in the control of Qing troops in Beijing. The rule results in the decline of the Ming dynasty with the ineffective leadership, increased role of famine with the declining trade and economic problems. Thus option B is correct.
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