1) Year-round schooling would help student achievement. (2) Not so much information would have to be crammed into nine months. (3) Furthermore, the elimination of long breaks, particularly summer break, would significantly reduce "learning loss” and the additional time wasted at the beginning of each academic year to reteach previously learned material. (4) It is clear that year-round schooling helps students learn and retain more. (5) The United States is not the only country to experiment with a year-round school schedule. (6) Although many still claim that evidence about year-round school and its link to higher achievement is inconclusive, these people need to open their eyes and see that students in these schools consistently score higher on certain assessments than students who attend schools with traditional nine-month calendars. (7) It is about time that we replaced our outdated and inefficient school calendars. If added after sentence 3, which sentence would most improve this conclusion?

This would cause less frustration for teachers because they would not have to plan a lesson to reteach a concept that the students should already know.
Because students would not need to spend so much time reviewing previously covered material, they would then have more time to master new concepts.
Spending time re-learning old material is something I always dreaded at the beginning of each new academic year because it was a waste of time.
Students would not lose as much information because the breaks would not be long enough for them to forget everything they learned the previous yea