What is the best definition of a primary source document

A primary source is a manuscript, diary or document from which information can be obtained. They are original narrations written at present time by people who have had an immediate relation with the subject matter of the text. They are considered genuine and reliable sources. For example, newspaper reports, photographs, videos, letters and interviews.

impartial means: treating all rivals or disputants equally; fair and just.

i would say that impartial is agreeing with something, because impartial means to treat your rivals, arguments, and reasoning equally and fair. so if you rival says something, agreeing on it means you did the impartial.