While all the answers have a degree of validity, option C is the most correct one. Flashbacks are essentially a narrative technique that allows the author to break the usual monotony of storytelling by jumping back and forth between events and turning a linear story (from point A to point B) into a circular one (from point B to point C through point A, for instance).
<span>I need to leave for school right now; however, I don't have all of my school supplies gathered.</span>
C . Ignore facts that contradict your position is your answer :)