Explanation:
I think they is referring to the audience
Because copper is expensive and there are better alternatives
1. China Experience a 400 year period of peace known as The Pax Sinica during the Han Dynasty
2. A golden age of expansion and culture occurs during the Tang Dynasty
3. The Ming Dynasty falls to the Qing
4. Nationalists and communists fight a civil war for control of China
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Since 'voice' in literature refers to the style of a certain writer, the words he uses, the sentences he makes, I would say that the answer here is D) the overall presence of a personality behind the text.
A) isn't correct because nonfiction isn't that subjective
B) description isn't that important
C) nonfiction has nothing to do with fictional stories
