Which of the Following Represents One of Qin Shi Huangdi's

Which of the following represents one of Qin Shi Huangdi's techniques of governance?

A) He eliminated the nobility as a distinct designation of status in society to prevent possible opposition to his rule.
B) He ruled directly over the massive new state he had conquered, not trusting any advisers or bureaucrats.
C) He required regional and local officials to answer directly to the emperor, who could dismiss them at will.
D) He placed all provinces under the rule of a military governor, who had absolute power to keep the peace and collect tribute.