Taking a position in an argument means taking a side. When taking a side in an argument, the author will most likely give you biased evidence. They will only give you reason to believe their side, without giving you any sort of evidence for the other side in the argument.
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It gives the reader an understanding of how a character understands their world. My favorite example of this was in 'The Boy in the Striped Pajamas'. While the main character isn't the narrator, it gives the reader insight into how much the character did NOT understand of his world.
The answer is D I believe
