The element which is found in primary-source historical documents is the first-hand view of the time period. Therefore C is the correct option.
The primary source historical document may include manuscripts, autobiographies and memoirs, letters, important recordings, photographs and newspapers, and so on. The primary source of historical documents gives the first-hand experience of the event. They are more reliable when it comes to tracking down events since they do not contain any modifications by the later generations.
Primary literary sources have got more advanced due to the advent of science. Since they give first-hand information about the events, therefore, C is the correct option.
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