Hmm.. I believe it's 3. sorry if it's wrong. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet. ...
Deductive reasoning. -Apex
B. Ten end-of-course exams were failed by ninth graders this year, a first for Lollapalooza High.
Survivor’s guilt, im not sure if this is supposed to be a multiple choice question but i would recommend adding the choices