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Bunuel
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For calculating range we must know

(1) m > n > 1

This statement tells us both m and n are greater than 1 or in other words 1 is the least integer of the set, but we still do not know whether m is greater than 21.
Hence, not sufficient

(2) n < m < 20
This statement tells us both m and n are smaller than 20 or in other words m is the smaller than 20 or 21 is the largest integer of the set, but we still do not know whether n is smaller than 1.
Hence, not sufficient

Combining both we get m and n are between 1 and 21

Hence, we know range is 21-1=20

Answer is C
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