Answer:
Mongols, non-Chinese, northern Chinese, southern Chinese
Step-by-step explanation:
The four social classes of the Chinese Yuan Dynasty in descending order are the Mongolians, Semu people (non-Chinese), the Han people (Northern Chinese), and the Southerners.
Back then, the Mongols were the most important and they were treated like royalty, while the Northern Chinese were treated very poorly.
Therefore, the list that correctly orders the Yuan dynasty social classes from most powerful to least powerful is option B.