Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. RXD RUJ RRP ROVARLCBRDACRDFDRLBAnswer: D. RLB Read Explanation: Analyze each position separately:1st letter: R, R, R, R → remains R2nd letter: X (24), U (21), R (18), O (15) → decreases by 3 each time, so next is L (12)3rd letter: D (4), J (10), P (16), V (22) → increases by 6 each time, so next is 28, which wraps around the alphabet to B (2)Therefore, the next letter-cluster is:RLB Read more in App