The verified answer to “In a certain code, NIGHT is written as THGIN. The source working states: Correct answer: KLIM (Option B). Apply the same unchanged rule to MILK: M→K, I→L, L→I, K→M. Therefore the required code is KLIM. Wrong options: NJML is wrong because it does not reproduce the verified rule at every position; OKNM is wrong because it does not reproduce the verified rule at every position; LHKJ is wrong because it does not reproduce the verified rule at every position. Even one mismatched position invalidates a code, so only Option B is correct. This observation must be confirmed across every available letter position or every consecutive term before it is applied to the missing code. Applying the verified rule to the target expression produces KLIM. The alternatives OKNM, LHKJ and NJML fail because at least one position does not obey the same transformation. A useful final check is to map KLIM backward through the inverse operation and confirm that the original target is recovered.