I think none of them were great honestly. They should not have been accepted
<span>Conditions when Tsar Nick was in power were not good. The average working day was 11 hours, six days a week. This was also for very little pay. This is one of the main events in the early days of Russia which contributed to the 1905 Revolution. Overall, the working conditions were terrible. Hope this answers your question. : )</span>
A) segregate blacks and whites.
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.