Three of the following four letter-clusters are alike in a certain way and one is different. Pick the odd one out.

In all the given options except option 1 the series alphabets are obtained by adding 4 in the previous one.

B+4--->F+4--->J

K+4--->O+4--->S

M+4--->Q+4--->U

D+3--->G+5--->L

Hence option 1 DGL is the odd one out of all the given options.

By: Himani Bihagra