Which of the following terms will replace the question mark (?) in the given series? JHOQ, NFSO, ? , VBAK, ZZEI

Correct — D. Do not read the clusters as words. Read the series one letter-column at a time, top to bottom.

Rule: column 1 +4, column 2 −2, column 3 +4, column 4 −2, wrapping past Z back to A.

Column 1: J, N, R, V, Z — +4 each.
Column 2: H, F, D, B, Z — −2 each, and B − 2 wraps to Z.
Column 3: O, S, W, A, E — +4 each, and W + 4 wraps to A.
Column 4: Q, O, M, K, I — −2 each.

The missing term is RDWM → option (d).

Why the others are wrong

• (a)
  RCWM — RCWM puts C in the second column. That column runs H, F, … at −2, so the third term is D, two behind F, not three.
• (b)
  RCXM — RCXM is wrong in two columns — C where the second column needs D, and X where the third needs W, because S + 4 = W.
• (c)
  RDMW — RDMW has all four correct letters but the last two are swapped: column 3 takes W and column 4 takes M.

A four-letter cluster series is four independent progressions stacked side by side. Each letter position keeps its own constant step, and the steps need not agree.

The blank sits third here, so every column is given four times over. That is more than enough to fix the step from the terms after the blank as well as before it — a free check most candidates skip.

Key facts

• Column 1 runs J, N, R, V, Z at a constant +4.
• Column 2 runs H, F, D, B, Z at a constant −2, wrapping B to Z.
• Column 3 runs O, S, W, A, E at a constant +4, wrapping W to A.
• Column 4 runs Q, O, M, K, I at a constant −2.

Common traps

• Working only from the two terms before the blank when the two after it settle the same step.
• Missing a wrap, so column 2 stops at B and column 3 stops at W.
• Picking an option that holds the right four letters in the wrong columns.

No directly related past PYQ was found.