For which of the following data sets is a histogram the most suitable graphical representation?
(a) Average monthly rainfall (in mm) recorded over a year
(b) Number of cars sold by a showroom each day of a week
(c) Marks of 100 students grouped into classes 0−9,10−19,…,90−99
(d) Favourite subjects (Maths, Science, English, Hindi) chosen by 200 students