By using complex syntax and academic diction, an author establishes which of the following?
a.
an optimistic tone
b. a reflective tone
c. the voice of an expert
od. the voice of a student
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D). The voice of a student.

Explanation:

As per the given description, the author grounds 'the voice of the student' by employing complex syntax and academic diction as they both contribute to create the desired tone or mood that would help evoke the desired response from the readers. The authors employ such devices particularly to create artistic impact through the use of words and phrases in a distinct manner that ultimately assists in eliciting the author's intended response. Thus, option D is the correct answer.