The verified answer to “In a certain code, WATER is written as YCVGT. The source working states: Correct answer: SWGGP (Option B). Apply the same unchanged rule to QUEEN: Q→S, U→W, E→G, E→G, N→P. Therefore the required code is SWGGP. Wrong options: RVFFO is wrong because it does not reproduce the verified rule at every position; PTDDM is wrong because it does not reproduce the verified rule at every position; OSCCL 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 SWGGP. The alternatives PTDDM, OSCCL and RVFFO fail because at least one position does not obey the same transformation. A useful final check is to map SWGGP backward through the inverse operation and confirm that the original target is recovered.