Verified Answer :

nochillalisa

They use all of them. They probably use more tools though because back then they probably didn't have too much paper

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The most reasonable answer would be: A) old books and papers.

A historian is an expert in history. There are chances that they would use old tools, pottery shards, old buildings, and ruins for their source of information, but if they would want to learn more accurate information about the past, they would use old books and papers.

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