C. Emperor Jiajing (Zhu Houqi), Emperor Sejong, reigned for forty years, contending with ministers for more than ten years, in order to make his father emperor, because he was not an orthodox heir, because the last emperor was an emperor without sons. Although he worked hard all his life as a monk, his power was still in his own hands, and the great traitor Yan Song was finally disposed of in his own hands, which was the most incompetent.
D emperor Wanli (Zhu Yijun), Zongshen, reigned for 48 years. In the first ten years, due to Zhang's reform, the Ming Dynasty was once ruled, but after Zhang's death, all political opinions were rejected. Later, because he wanted to have three sons, he argued with the minister for more than ten years (according to the Ming system, he couldn't abandon the long and raise the young), but he didn't go to court for more than twenty years, but Wanli still had three great achievements in his reign, that is, he won three games.
B. Emperor Apocalypse (Ming Xizong), Zhu Youxiao, reigned for seven years. When he was in power, there was a case of moving the palace. Later, he worked hard as a carpenter, and the kingdom was handed over to Wei Zhongxian. Finally, he died of illness. It is said that he fell ill because of drowning, but his constitution is also very poor, which is related to excessive wine and color. Wei Zhongxian's problem was not solved until his younger brother Zhu Youjian became emperor. So the apocalypse should be the most corrupt and incompetent emperor.
Other emperors are very good. The worst was Emperor Taichang, who died only 29 days later, but he still made some achievements, such as eliminating corrupt officials.
Taizu, Wendi, Chengzu, Renzong, Xuanzong, Wuzong, Sejong, Mu Zong, Zongshen, Guangzong, Xizong and four cases, the top three are not natural, and neither is Ren Xuan's rule, so the final answer should be Xizong.