In every option the difference between each letter is '3' except for option D
1)ADG : A + 3 = D, D + 3 = G
2)HKN : H + 3 = K, K + 3 = N
3)ORU : O + 3 = R, R +3 = U
4)BDF : B + 2 = D, D + 2 = F
Hence Option DÂ is correct
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