Find the odd number / letters / word from the given alternative:

1, 4, 3, 8
2, 4, 3, 9
3, 2, 3, 8
5, 3, 2, 9

The answer is C. 3, 2, 3, 8.

In each of the other options, the numbers are all in increasing order. In option C, the number 3 appears twice.