The following bar graph shows the results of an annual examination in a secondary school. Read the bar graph (Figure) and choose the correct alternative in each of the following: The pair of classes in which the results of boys and girls are inversely proportional are: (a) VI, VIII       (b) VI, IX      (c)  VIII, IX   (d)  VIII, X The class having the lowest failure rate of girls is VII     (b)  X         (c)  IX          (d)  VIII The class having the lowest pass rate of students is VI             (b)  VII       (c)  VIII         (d)  IX