If the sum of the digits of any integer lying between 100

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If the sum of the digits of any integer lying between 100 and 1000 is subtracted from the
number, the result always is

1. divisible by 6
2. divisible by 2
3. divisible by 9
4. divisible by 5

Correct Option: C

Number = 100p + 10q + r
Sum of digits = p + q + r
Difference = 100p + 10q + r – p – q – r
Difference = 99p + 9q = 9 (11p + q)
Therefore , required answer is 9 .