Explanation:

Let's break down the logic:

- Observe the relationship between KTM and PGN:

- K (11th) ? P (16th): +5 letters forward

- T (20th) ? G (7th): -13 letters backward (wraps around alphabet)

- M (13th) ? N (14th): +1 letter forward

- Apply the same shifts to ABC:

- A (1st) + 5 ? F (6th)

- B (2nd) - 13 ? O (will go negative: 2 - 13 = -11; wrap to 26 + (-11) = 15; 15th letter = O)

- C (3rd) + 1 ? D (4th)

- So, same pattern gives FOD.

- However, all options are Z___. Let's look closer:

- Alternatively, notice: KTM is alphabetical order, PGN is in reverse:

- K ? P, T ? G, M ? N: Could it be about mirroring?

- The reverse pairs in alphabets (A?Z, B?Y, C?X, ...)

- Let's try mapping each letter in ABC to its opposite:

- A ? Z (1 ? 26)

- B ? Y (2 ? 25)

- C ? X (3 ? 24)

- So, ABC's opposite is ZYX

Now check options:

1. ZWY (Incorrect)

2. ZYW (Incorrect)

3. ZYX

4. ZXY (Incorrect)

Correct Answer: 3. ZYX

- The pattern matches, ABC to ZYX uses alphabetical mirroring.

- KTM to PGN uses the same logic (each letter paired with its alphabetical opposite at same distance from ends).