Correct Answer: 91

Solution : Let's check the options –
First option: 108; 1 + 0 + 8 = 9; The sum of the digits of the number is 9.
Second option: 91; 9 + 1 = 10; The sum of the digits of the number is 10.
Third option: 144; 1 + 4 + 4 = 9; The sum of the digits of the number is 9.
Fourth option: 225; 2 + 2 + 5 = 9; The sum of the digits of the number is 9.

So, the second option is different from the other three options as the sum of the digits of the given number is 10 instead of 9. Hence, the second option is correct.