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

The answer is D. GIQ.

In each of the other options, the first letter is followed by the third letter of the alphabet, and the second letter is followed by the fourth letter of the alphabet. For example, in BDW, the first letter B is followed by the third letter D, and the second letter W is followed by the fourth letter H.

However, in GIQ, the first letter G is followed by the fourth letter I, and the second letter Q is followed by the third letter K. This is the only option where the order of the letters is not consistent.