Difficulty: Easy
Correct Answer: CFI
Explanation:
Introduction / Context:Here, each of the three letter positions undergoes the same forward shift by a fixed value across terms.
Given Data / Assumptions:
Concept / Approach:Compute letter-to-letter jumps across terms for each position; a constant +9 emerges.
Step-by-Step Solution:
First letters: B(2) → K(11) (+9) → T(20) (+9) → C(3) (+9 wrap).Second letters: E(5) → N(14) (+9) → W(23) (+9) → F(6) (+9 wrap).Third letters: H(8) → Q(17) (+9) → Z(26) (+9) → I(9) (+9 wrap).Verification / Alternative check:Reversing from CFI by −9 retrieves TWZ, confirming the fixed-shift pattern.
Why Other Options Are Wrong:IJL, BDF, ADG use different step sizes and do not preserve the +9 rule in all three positions.
Common Pitfalls:Missing wrap-around arithmetic when passing Z to A.
Final Answer:CFI.
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