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B; Because students would not need to spend so much time reviewing previously covered material, they would then have more time to master new concepts.

Explanation:

By using the process of elimination, it becomes obvious that letter B is the only viable answer.

A is incorrect because the sentence would not be in line with the thesis, "Year-round schooling would help student achievement," as the sentence discusses how year-round schooling would help the teachers, not the students.

C is incorrect because it uses the personal pronoun, "I," which is the incorrect formatting for an argumentative editorial as they are meant to be objective.

D is incorrect because it discusses information that was relevant to two sentences prior, meaning it would be better off grouped with that sentence rather than with the sentence immediately prior.

Therefore, the answer must be B because one, the other answers aren't viable, and two, because it groups perfectly with the sentence immediately prior, is in line with the thesis, and fits the format of an argumentative editorial.

the speaker versus the boy.