The correct answer is A) Intellectual and economic activity could not advance because of the intensity and duration of the warfare.
What happened in China during the warring states period of the Zhou Dynasty between 476-221 B.C.E. was that Intellectual and economic activity could not advance because of the intensity and duration of the warfare.
This period represented an era of conflict and division in ancient China. Many states were at permanent war during the period known as the Warrior States period. It was the last period of the Zhou Dynasty. It was a conflcitive time when states declared independence and wanted no relationships with the Zhou Dynasty. Among these states were Wei, Chu, Qin, Zhao, Qi, Yan, and Han. This warring time ended when Qin conquered the other states.