_ > _ > _ > _ C > A, E ...........(i)
B > D > _ > _ > _ > _ ...........(ii)
Since E did not score the least, we get B > D > F (81) > C > E (62) > A
(a) is the correct answer; C is most likely to score 70 marks as he is between F, who scored 81 marks and E, who scored 62 marks.
