Answer:
C. A more thorough analysis of the impact on history of an event.
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Secondary sources would be valuable to a historian in order to provide a more thorough analysis of the impact on history of an event. Hence, option C is correct.
Secondary sources is the analysis or evaluation of the historical event, era, or phenomenon, by using the primary source of data. Secondary source is mostly likely to be critiqued or the review of the primary, as they are continuing the primary data.
Secondary source generally includes books, journal articles, speeches, reviews, research reports, and more. Secondary sources are used by academics to support their primary sources when they are writing about historical figures, events, artifacts, or concepts.
Thus, option C is correct.
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