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IMO C
Explanation for A,D,and E have already given.
In B there 'it' is redundant as it is changing the meaning of the sentence.
took 700,000 artisans more than 36 years to complete it
the army dint took 700,000 artisans to complete itself.
If we would have been talking about someone else say aritsan completed the army the use of it would be better
But here author is talking about the army, army itself took 700,000 artisans to get completed by the artisans. So it is redundant, Hence C is correct.
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