When a primary source contains a clear bias, a historian should use the source to create a more reliable secondary source.
What is a primary source?
This refers to those information that was created at the same time as an event or by a person directly involved in the event such as diaries, speeches, letters, official records, autobiographies etc.
It is also the original document, or first-hand information that is closest to what is being studied.
Therefore, the Option C is correct.
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