Explanation:

Let's analyze the series:

SYGZ, NIRT, ?, DCNH, YMYB

- Look at the position of each letter in the alphabet for each cluster:

- S Y G Z (19, 25, 7, 26)

- N I R T (14, 9, 18, 20)

- ?

- D C N H (4, 3, 14, 8)

- Y M Y B (25, 13, 25, 2)

- Try to find the pattern:

- Pattern 1: SYGZ ? NIRT (Difference: -5, -16, +11, -6)

- NIRT ? ?

- ? ? DCNH

- Let's check each option:

- Option 1: ITXN

- I T X N (9, 20, 24, 14)

- N I R T (14, 9, 18, 20) to I T X N (-5, +11, +6, -6)

- ITXN to DCNH (9, 20, 24, 14 ? 4, 3, 14, 8) (-5, -17, -10, -6)

- Pattern not matching clearly.

- Option 2: ISCN

- I S C N (9, 19, 3, 14)

- N I R T to ISCN (-5, +10, -15, -6)

- ISCN to DCNH (9, 19, 3, 14 ? 4, 3, 14, 8) (-5, -16, +11, -6)

- Could be a possible match but let’s see others.

- Option 3: JTZN

- J T Z N (10, 20, 26, 14)

- N I R T to JTZN (-4, +11, +8, -6)

- JTZN to DCNH (10, 20, 26, 14 ? 4, 3, 14, 8) (-6, -17, -12, -6)

- Doesn’t fit pattern.

- Option 4: JSVN

- J S V N (10, 19, 22, 14)

- N I R T to JSVN (-4, +8, +4, -6)

- JSVN to DCNH (10, 19, 22, 14 ? 4, 3, 14, 8) (-6, -16, -8, -6)

- Pattern not matching.

- When checking the difference, only Option 2: ISCN

- From NIRT to ISCN: (-5, +10, -15, -6)

- From ISCN to DCNH: (-5, -16, +11, -6)

- If we check forward and backward, this matches the sequence best.

- The differences between clusters show a logical and alternating pattern, supporting option 2 as correct.

Correct answer: Option 2 (ISCN)