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The following data : `2, 5, 15, 25, 20, 12, 8, 7, 6, 16, 21, 17, 30, 32, 23, 40, 51, 15, 2, 9, 57, 19, 25` is grouped in the classes `0 –5, 5 –10, 10 –15` etc. Find the frequency of the class 20 –25.
Options:

(a) 5

(b) 4

(c) 3

(d) 2

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