The answer is D. BSDR.
The other options, A, B, C, and E, all have a pattern of alternating consonants and vowels. For example, in A, OUQT, the first letter is a vowel, the second letter is a consonant, the third letter is a vowel, and so on. In B, QFSE, the first letter is a consonant, the second letter is a vowel, the third letter is a consonant, and so on. In C, LKNJ, the first letter is a consonant, the second letter is a vowel, the third letter is a consonant, and so on. In E, UCYB, the first letter is a vowel, the second letter is a consonant, the third letter is a vowel, and so on.
However, in D, BSDR, the first letter is a consonant, the second letter is a consonant, the third letter is a vowel, and so on. This does not follow the pattern of the other options.