Question

which statement primarily appeals to ethos to support the position that schools should eliminate long summer vacations in favor of a year - round calendar?
despite the opposition from students that a year - long schedule would surely cause, eliminating long summer vacations would provide a number of important benefits, including improved student learning outcomes.
although it may come as a surprise, i would prefer a year - round school schedule to our current system. as an academically competitive high school junior, i would appreciate a shorter summer break, since it would help limit the typical summer \memory loss.\
long summer breaks are famously associated with relaxation so extreme that it verges on sloth, as students sleep until noon and spend hours lounging with friends.

Explanation:

Ethos is an appeal to credibility. The second statement mentions the speaker is an "academically competitive high school junior," which establishes their credibility (ethos) in discussing the impact of summer breaks on learning (like summer "memory loss"). The first statement just lists benefits without establishing credibility. The third statement is a negative stereotype without credibility - building.

Answer:

"Although it may come as a surprise, I would prefer a year - round school schedule to our current system. As an academically competitive high school junior, I would appreciate a shorter summer break, since it would help limit the typical summer'memory loss.'"