How did the dynasty of Zhou ended?

Answer The beginning date of the Zhou has long been debated. Traditionally, it has been given as 1122 bce, and that date has been successively revised as scholars have uncovered more archaeological evidence. The most recent findings have placed the outright start of the dynasty at 1046 bce. The dynasty ended in 256 bce.:The Warring States Period

The partition of the Jin state created seven major warring states. After a series of wars among these powerful states, King Zhao of Qin defeated King Nan of Zhou and conquered West Zhou in 256 BCE; his grandson, King Zhuangxiang of Qin, conquered East Zhou, bringing the Zhou Dynasty to an end.

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Explanation:

The partition of the Jin state created seven major warring states. After a series of wars among these powerful states, King Zhao of Qin defeated King Nan of Zhou and conquered West Zhou in 256 BCE; his grandson, King Zhuangxiang of Qin, conquered East Zhou, bringing the Zhou Dynasty to an end.

definitely a for sure. ill see and update if i get the answer

b - those executed came from every social and economic class