Historians should use more than one source of information because two sources of historical information can give more information than just one. Option C is correct.
Historians use two sorts of sources such as primary sources and secondary sources in order to a particular period of history.
On the one hand, primary sources include any mechanical device or evidence of witnesses which was exposed when an event occured in history. On the other hand, secondary sources entail all those evidences recorded by people who did not witnessed the incident or event which took place.
Historians use several sources including a variety of architectural and textual records, coins and inscriptions.
