When a Breakdown in Authority Occurred During China's Era of the Warring

When a breakdown in authority occurred during China's era of the Warring States,

A) the Qin emperor was overthrown, which proved to the people that he had lost the mandate of heaven.
B) the door was opened to Legalist theories which centered on strong governmental control of the people.
C) the people turned their backs on Confucius, believing that his principles had proven themselves unworkable.
D) members of the Zhou Dynasty adopted Legalist ideas to keep themselves in power.
E) Confucian ideals lost out to Legalist principles for the time being, and the central government exerted much greater control over the people.