Which Chinese philosophical school argued that a strong state was necessary in order to have a good society?

The correct answer to the following question will be "Legalism".

Explanation:

Legalism, the philosophy of Chinese psychology that gained popularity throughout the turbulent period, which formed the ideological foundation of China's first ruling dynasty, the Qin, through the effect of philosophers Li Si, Shang Yang, and Hanfeizi. This school claimed that only to get a successful society a strong state was required.

Therefore, it's the right answer.

Legalism

Explanation:

Legalism is a Classical Chinese philosophy which found its root in the fourth century B. C, which stresses the necessity of law and order above all human conditions. It believes attempts to improve the human situation were useless and there was strong need of a strong government and a carefully crafted code of law, along with a police force that would strictly implement these rules and harshly punish even the smallest offences.