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I think the statement "Although counties of the largest unit of local government they are not always the most influential" is true
A primary source is a source that was created by a person who was there to witness it. So, the answer would be A, a document made by someone who actually saw an event. In other words, the document was written by someone who was there to witness the event.
Trust within the community, not being stupid, and a sense of political (or physical) strength.