Select the letter-cluster that will replace the question mark (?). CHI, FKL, INO, LQR, ?

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Accepted Answer

1. Look at first letters: $C(3),F(6),I(9),L(12)$. They go up by $3$. Next is $O(15)$.  
2. Look at second letters: $H(8),K(11),N(14),Q(17)$. They go up by $3$. Next is $T(20)$.  
3. Look at third letters: $I(9),L(12),O(15),R(18)$. They go up by $3$. Next is $U(21)$.  
4. Combine them: **OTU**. This is option **(b)**.  
FINAL_ANSWER: b

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