The answer for this question is: Write The main duty of a historian is to record a specific event in human history that could be passed throughout future generations. Because of this, the most important skill to be had for historians is the ability to transform the event into a medium that could be read and understood by the generation after us.
That is describing what the character does so it is C. It couldn't be A because it isn't a part of the story. It couldn't be B because it isn't a problem. It lastly couldn't be D because it's not a message the author is trying to convey to the reader.