Three of the following four letter-clusters are alike in a certain way and one is different.
Pick the odd one out.
If you clearly check all the alphabets you will see a pattern, which is not present in D.
For example,
A.OQTX = O+2 = Q +3 = T +4 = x
B.EGJN = E + 2 = G+ 3=J +4 =N
C.ACFJ = A +2 =C +3 =F +4 =JÂ
D.IKNQ = I + 2 = K +3 = N + 3= Q
Hence D
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