Which of the following is a complex sentence?
a. check out the editorial page in today's paper and you'll notice the piece by oscar lewis.
b. as jake was reading the letter from june yet again, the flight attendant coughed gently to get his attention.
c. i simply cannot make heads or tails of rap lyrics, but i suppose i'm just too old to understand them.
d. i would like to visit the kinshasa, but i understand the city is unsafe for foreigners

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 (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone