Final answer:
Sentence 4 should be removed from the student's conclusion because it unnecessarily restates the already presented claim of the editorial, contributing to redundancy rather than strengthening the argument.
Step-by-step explanation:
The student's question is regarding why sentence 4 should be removed from the rough draft of a student's conclusion to an argumentative editorial. Sentence 4 reads, "It is clear that year-round schooling helps students learn and retain more." The reason this sentence should be removed is because it unnecessarily restates the editorial's claim, which was already presented earlier in the conclusion. It does not add new information or provide additional support, and good writing practices include avoiding redundancy to maintain the strength and conciseness of the argument.