According to the research, the correct option is B. A diary by a pioneer in Wyoming is most clearly a primary source.
They are those whose information is original, that is, they are objects, images or documents created in a historical moment that provide a personal look at an event whose content has not been treated or analyzed by a researcher.
That is, these original documents reflect the individual point of view of a participant or observer, which allows us to get as close as possible to understanding the lived experiences of others, these can be paintings or photos, newspapers, speeches, diaries, letters, interviews, among others.
Therefore, we can conclude that according to the research, the correct option is B. A diary by a pioneer in Wyoming is most clearly a primary source.
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