If I understand your question correctly, the voice in a text is the dialogue, tone, narrator, or the characters. It can be the mood, tone, and the point of view of the characters, author, and the narrator.
The right answer for the question that is being asked and shown above is that: "C. Students in Fresno score higher in English than do students in Tacoma; <span>A. There may be a correlation between the presence of a dirt track and higher test scores; or, more likely, the fact that Fresno has a dirt track and its students get higher test scores may be a coincidence."</span>
