The sum of the digits of a number is subtracted from the number, the resulting number is always divisible by:

The correct option is B: $9$

Let us assume a number $19$

Sum of its digit $=1+9=10$

If the sum is subtracted from the given number then the result will be

$19-10=9$

so, the final result $9$ is divisible by $9$.

Hence, we can say that the resulting number will always divisible by $9.$