Explanation:

Let’s break this down step by step:

- The series you gave: DNU, ?, NXE, SCJ, XHO

- Let's look at each spot in the triplet (first, second, third letter) and see if there's a pattern.

First letters:

D ? N ? S ? X

- D+10 = N, N+5 = S, S+5 = X (alphabetically, D(4) to N(14): +10, N(14) to S(19): +5, S(19) to X(24): +5)

Second letters:

N ? ? ? X ? C ? H

- N(14) ? X(24): +10, X(24) ? C(3, after wrapping round): +5, C(3) ? H(8): +5. But wait, we’re missing the second letter for the second term. If we go in reverse:

H(8) - 5 = C(3), C(3) - 5 = X(24, because alphabet loops), X(24) - 10 = N(14). Reverse order looks fine.

Third letters:

U ? ? ? E ? J ? O

- U(21) ? E(5): +10 (loops around Z), E(5) ? J(10): +5, J(10) ? O(15): +5

Logically, every jump in the sequence is +10, +5, +5 forward (with wrap-around as needed).

So, filling in the gaps:

- D+10 = N

- N+5 = S

- S+5 = X

Second letter sequence:

- N+10 = X

- X+5 = C

- C+5 = H

Third letter sequence:

- U+10 = E

- E+5 = J

- J+5 = O

So, the missing part (the second term) would be:

First letter: D + 5 = I

Second letter: N + 5 = S

Third letter: U + 5 = Z

So, ISZ.

Let’s review your options:

- Option 1: GQW – doesn’t fit.

- Option 2: GPV – doesn’t fit.

- Option 3: HRY – doesn’t fit.

- Option 4: ISZ – matches our answer.