Select the letter-cluster that will replace the question mark. ACE, BDF, CEG, ?

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Accepted Answer

1. Write positions: $A(1), C(3), E(5)$; $B(2), D(4), F(6)$; $C(3), E(5), G(7)$.  
2. **Rule:** each letter moves by $+2$ in alphabet position.  
3. Apply the rule to the next start letter $D(4)$: $D(4), F(6), H(8)$.  
4. The next cluster is **DFH**.  
FINAL_ANSWER: c

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