1. What
happened
during the
Warring
States
period?

During the Warring States Period, nobles stopped supporting the Zhou Dynasty (1046–221 BC), and Zhou's vassal states declared themselves independent from Zhou, becoming kingdoms or warring states. Chu became the biggest state. It controlled the southern third of the entire region of the Warring States.

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The Warring States Period in China (475-221 BC) ... TheWarring States Period (475–221 BC) was an era of division in ancient China. After the relatively peaceful and philosophical Spring and Autumn Period, various states were at war before the Qinstate conquered them all, and China was reunited under the Qin Dynasty.

a is the answer i believe.

an economic of depression