Explanation:

To determine which option does not belong to the group, we need to find a common characteristic among the given options and identify the one that does not possess that characteristic. Let's analyze each option:

a) GFI:
- It contains three letters: G, F, and I.
- There is no specific pattern or relationship among the letters.
- It does not share any common characteristic with other options.

b) QOR:
- It contains three letters: Q, O, and R.
- There is no specific pattern or relationship among the letters.
- It does not share any common characteristic with other options.

c) LKN:
- It contains three letters: L, K, and N.
- There is no specific pattern or relationship among the letters.
- It does not share any common characteristic with other options.

d) YXA:
- It contains three letters: Y, X, and A.
- There is no specific pattern or relationship among the letters.
- It does not share any common characteristic with other options.

e) TSV:
- It contains three letters: T, S, and V.
- There is no specific pattern or relationship among the letters.
- It does not share any common characteristic with other options.

Conclusion:

After analyzing all the options, we can see that none of them share a common characteristic or pattern. Therefore, there is no clear distinction between the options. However, if we have to choose one option that does not belong to the group, we can select option 'B' (QOR) arbitrarily as it does not possess any unique characteristic that sets it apart from the others.