Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
RV23, QU32, PT41, OS50, ?

Correct option is C

Information Given:
Series: RV23, QU32, PT41, OS50, ?

Logic:
Both letters decrease by 1.
Number increases by 9.

Explanation:
1st letters: R → Q → P → O → N (−1)
2nd letters: V → U → T → S → R (−1)
Numbers: 23 → 32 → 41 → 50 → 59 (+9)
So, the next term is NR59.

Final Answer:
NR59

Final Correct Option:
C