Out of the four letter-clusters listed, three are alike in some manner and one is different. Select the odd one.

 Logic: +5, -2, +5​
Option (a) JOMQ:

J to O: +5

O to M: -2

M to Q: +4

K to P: +5

P to N: -2

N to S: +5

E to J: +5

J to H: -2

H to M: +5

U to Z: +5

Z to X: -2

X to C: +5

The first three letter-clusters follow the same pattern (+5, -2, +5), while JOMQ deviates in which is (+5, -2, +4) So, the correctanswer is (a).