How did confucianism affect the government of the han dynasty?

The Han Dynasty did benefit from Confucianism. Because of it, the Han Dynasty improved and established the system of ruling the land by morals and ethics, something that the Qin Dynasty has overlooked. The establishment of a Confucian state has helped Han Wudi rule for 54 years, making him one of the longest rulers in China’s history. But might be wrong

The answer should be a.