Explanation:

The given options are:
a) OQMS
b) UAWY
c) NPLR
d) BDZF
e) FHDJ

To determine the option that does not belong to the group, we need to identify a pattern or rule that applies to the other options.

Pattern:
Upon observation, we can see that each option consists of a sequence of letters. Each letter in the sequence is obtained by moving one step forward in the alphabet from the previous letter.

For example:
- In option a) OQMS, the next letter after O is P, after Q is R, after M is N, and after S is T.
- Similarly, in option c) NPLR, the next letter after N is O, after P is Q, after L is M, and after R is S.

Identifying the option that does not fit:
Now let's apply the same pattern to each option and see which one does not fit.

- In option b) UAWY, the next letter after U is V, after A is B, after W is X, and after Y is Z. So this option fits the pattern.
- In option d) BDZF, the next letter after B is C, after D is E, after Z is A, and after F is G. So this option fits the pattern.
- In option e) FHDJ, the next letter after F is G, after H is I, after D is E, and after J is K. So this option fits the pattern.

Conclusion:
By applying the pattern to each option, we can see that all options except option b) UAWY fit the given pattern. Therefore, option b) UAWY does not belong to the group.