Explanation:

Let’s break down each option:

- Option 1: IDWG

- I (9), D (4), W (23), G (7)

- No clear arithmetic or letter pattern links all the letters.

- Option 2: BTGN

- B (2), T (20), G (7), N (14)

- Again, letters seem scattered, no obvious symmetry or sequence.

- Option 3: FJQL

- F (6), J (10), Q (17), L (12)

- These are not all consecutive, nor do they form any unique grouping.

- Option 4: EMNK

- E (5), M (13), N (14), K (11)

- Here, M, N, K are together in the alphabetical sequence (K, L, M, N), so three out of four letters are tightly clustered.

Here’s what’s really going on: In IDWG, BTGN, and EMNK, you get at least three letters that are pretty close or form some recognizable block in the alphabet. FJQL is different—those letters are more spread out, with no such cluster.

So the letter-cluster that doesn’t fit is FJQL.

- Option 3: FJQL is the odd one out, because its letters aren't grouped in the way the others are.