Respuesta :
c. a journal written by a soldier during the American Revolution
The correct answer is C) a journal written by a soldier during the American Revolution.
The source that has the appropriate qualifications to be considered a credible source about life in the Continental Army is a journal written by a soldier during the American Revolution.
This kind of source would be a valid primary source of information because was written by an individual that directly participated in the Revolutionary War of Independence. He was a soldier in the Continental Army and lived and witnessed everything he wrote about. His stories and anecdotes would be very important to a historian who is studying this period of US history.