Answer:
C. John Adams by David McCullough.
Explanation:
A secondary source is when a person or event is written from someone who has knowledge of the event, but did not take part in the event itself.
All others are primary sources, specifically autobiography's, in which each of them essentially wrote about themselves.
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The main conflict or idea of the article would be the most important part of the summary.
The answer is masculine let me know if you need any other assistance