Select the letter-cluster that can replace (?) HLPT, HOUA, HRZH, ?

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Accepted Answer

1. Look at each column of letters separately.

2. First letters are all **H**, so keep **H**.

3. Second letters: L(12) → O(15) → R(18). Each step +3. Next: $18+3=21$ → **U**.

4. Third letters: P(16) → U(21) → Z(26). Each step +5. Next: $26+5=31$, wrap $31-26=5$ → **E**.

5. Fourth letters: T(20) → A(1) → H(8). Each step +7. Next: $8+7=15$ → **O**.

So the next cluster is **HUEO**.

FINAL_ANSWER: a

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