Which sentence contains the best example of parallelism? A. To an experienced climber, the ascent of the first peak was a gentle half day's journey, but further challenges lay in wait.
B. One of the guides fell ill, and the next day we heard that our leader would not be able to join—and this was only days before we were scheduled to begin the climb.
C. Because the climb was so complex, our leader proposed that we start by mapping the route, analyzing its challenges, and making backup plans.
D. To prepare for the climb, Maya went to the gym regularly, adding climbing classes to her strength training and other routines.

Read the rough draft of a student's conclusion to anargumentative editorial.(1) year-round schooling would student achievement.(2) not so much information would have to be crammed intonine months. (3) furthermore, the elimination of long breaks,particularly summer break, would significantly reduce"learning loss" and the additional time wasted at thebeginning of each academic year to reteach previouslylearned material. (4) it is clear that year-round schooling students learn and retain more. (5) the united staleis not the only country to experiment with a year-roundschool schedule. (6) although many still claim that evidenceabout year-round school and its link to higher achievement isinconclusive, these people need to open their eyes and seethat students in these schools consistently score higher oncertain assessments than students who attend schools withtraditional nine-month calendars. (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone