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.
Explanation:
volunteering in the community.
I think that the Miranda warning is good because the problem was trying to determine what counted as a coerced confession. Well into the 20th century, police officers would beat suspects, or keep defendants in isolation for days, to get a confession. The methods of police interrogation were so diverse, and the effects of isolation, intimidation and defendant ignorance so varied, that appellate courts found it difficult to determine afterward whether a confession had been truly voluntary.