Based on the provided excerpt, the most accurate conclusion about Emperor Qin Shi Huang's governing methods is:
D. He used Legalism to unify the empire of China.
The excerpt does not mention anything about Emperor Qin Shi Huang's cause of death or his rule ending due to an army revolt. It does, however, state that he unified all warring states and ruled with absolute control, which aligns with the principles of Legalism. The emphasis on construction projects such as the Great Wall, Grand Canal, and roads also reflects his desire for centralization and infrastructure development, which were key aspects of his governing approach. The excerpt does not explicitly state that he believed economic progress was the true mark of a successful empire, so option E cannot be definitively concluded based on the given information.