Year-round schooling has no constructive impact on education. Most year-round schedules use the 45-15 method: 45 days of school followed by 15 days off. The frequent transitions from school to vacation can disrupt the learning process. Students with low grades do not raise those grades when they transfer to a year-round school. These transitions also don't allow students to attend camp in the summertime. Kids who go to camp learn to be more independent critical thinkers because of the challenges camp provides. In addition, keeping a school open year-round costs much more money. Air conditioning bills in the summer can skyrocket a school's expenses. Due to that, many schools that change to year-round schedules end up switching back. Since 1980, the majority of schools that tried the year-round schedule changed back to a traditional calendar. I think it is obvious that changing to year-round schooling does not help students. Therefore, why is the change necessary?

Which sentence presents weak evidence for the passage's claim that year-round schooling has no constructive impact?

In addition, keeping a school open year-round costs much more money.

Most year round schedules use the 45-15 method: 45 days of school followed by 15 days off.

Students with low grades do not raise those grades when they transfer to a year-round school.

Air conditioning bills in the summer can skyrocket a school's expenses.