Emperor Wudi of the Han Dynasty implemented Confucian ideals into his governance, which significantly influenced his treatment of the nobility. The correct analysis based on the Confucian principles would be reflected in the response that highlights meritocracy over traditional hereditary privilege.
The responses "He made the nobles pass a civil service test" and "He gave power to people who passed Confucianism tests" both imply that Emperor Wudi sought to incorporate merit-based assessments within the governance structure, which aligns with Confucian values emphasizing education, moral integrity, and the selection of officials based on their abilities rather than their noble lineage.
In contrast, the responses indicating an increase in the power of the nobility or that nobles were punished less severely than peasants do not align with the Confucian focus on meritocracy and ethical governance. Instead, during Wudi's reign, he aimed to empower educated individuals (often from the scholar-official class) and diminish the hereditary privilege of the nobility.
Thus, the best analysis of Confucianism's impact on Emperor Wudi's treatment of the nobility would be reflected in the responses emphasizing civil service tests and the merit-based appointment of officials.