The author's purpose for including these details of the narration and description which were used is:
According to the given question, we are asked to state the author's purpose for including these details of the narration and description which were used and their relevance.
As a result of this, we can see that there is the narration about the historical context of the settings and the characters which were used and how Mrs Bates and the Governor were instrumental to the plot of the story.
Therefore, the correct answer is option C
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