After,afterward,afterthat,atfirst,atthistime, before,beginningwith,beyond,during,earlier, endingwith,eventually,finally,following,from thenon,inthemeantime,last,later,meanwhile, next,now,since,soon,then,until,while
C is the right one. Unlike quotations or paraphrased ideas, information that's considered "common knowledge" doesn't need to be cited. "Common knowledge" is information that's considered widely known or easily verified.
Number 5 should be the answer
