Beatrice was unable to concentrate on her project because her brother’s stereo was turned up to full volume.

which statement is correct?

a comma is needed in this sentence before the word "because" to separate the dependent clause from the independent clause.
the phrase "on her project" should be separated from the rest of the sentence by commas on both sides.
the dependent clause follows the independent clause in this sentence, so no comma is needed.
this is a compound sentence made up of two independent clauses, so no comma is needed.

All of the following quotes are examples of foreshadowing from the swimming contest except

Could someone me with this question?

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 (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone