challenge: What was the outcome of Erzhu Rong's confrontation with Emperor Xiaozhuang in 530?
  
  A. Erzhu Rong was ambushed and killed by Emperor Xiaozhuang
  B. Erzhu Rong was appointed as the new Emperor of Northern Wei
  C. Emperor Xiaozhuang was forced to abdicate the throne
  D. Erzhu Rong and Emperor Xiaozhuang formed an alliance to defeat a common enemy
  Answer: 