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.
A.
What A basically says is that the British allowed African American people to vote, since they where a minority and would never be too influential in elections.
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Lebensraum translates as 'Living room'.
It was the belief that Germany should conquer neighbouring countries in order to make room for their Aryan master race to thrive.
