Final answer:
Qin emperor Shi Huangdi's achievement
Step-by-step explanation:
The correct answer is C. Adoption of Confucianism. Qin emperor Shi Huangdi did not adopt Confucianism as one of his achievements. Instead, he suppressed Confucianism and favored Legalism, which was a different philosophical and political system. During his reign, he centralized power and created a highly centralized and autocratic government. He also expanded the empire, simplified the Chinese language, and ordered the construction of the Great Wall.
Learn more about Qin emperor Shi Huangdi's achievements in China