Select the letter-cluster that will replace the question mark. BCF, GHK, LMP, ?

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Accepted Answer

1. Write positions: $B(2),C(3),F(6);\; G(7),H(8),K(11);\; L(12),M(13),P(16)$. 
2. The first two letters are consecutive in each group: $(2,3),(7,8),(12,13)$, each start +5 from previous. 
3. The third letters are $6,11,16$, also +5 each time. 
4. Add $5$ to each position: first $12	o17(Q)$, second $13	o18(R)$, third $16	o21(U)$. So the cluster is **QRU** (option d). 
FINAL_ANSWER: d

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