It may be inferred that the diction of the author in the above excerpt is best described as scholarly. (Option D)
Diction in this context refers to the tone of the author with which they have hosed to express the ideas in the excerpt.
Another word for diction in this case is tone. When a tone or bis said to be scholarly, it means that there is a focus on precise and accurate delivery of thoughts and ideas.
That is, The purpose of scholarly (or academic or professional) diction is to express information and ideas clearly and accurately utilizing terminology and basic concepts specific to your area.
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