The correct answer is - D. how to make iron.
The Zhou dynasty was one of the greatest dynasties of China, and among many achievements of their reign, the artisans of this dynasty managed to learn how to make iron. This was revolutionary for the Chinese people, and it was of great use in the agriculture after the tools for it started to come in iron version, and it made everything much easier, quicker, and more efficient.
This is correct except switch 3 and 4 around. Hope this helps you!
Its sort of like a custom.Its not really written down and there is no legal punishment, but if you disobey the custom you will in some way be shunned or punished by the people who follow that custom.
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