All third-year students at Hogwarts must take at least one elective subject. The most popular three elective subjects are Care of Magical Creatures (CoMC), Ancient Runes, and Divination. Using historical data, we have determined the number of students enrolled in these three subjects from Gryffindor, Ravenclaw, Hufflepuff, and Slytherin houses during their third year at Hogwarts over the past 50 years. Required:
a. Which house has the fewest students?
b. Among the 4 houses, which has the highest proportion of Runes students?
c. Which elective subject has the fewest students?
d. Among the 3 elective subjects, which has the highest proportion of students in the Griffindor house?