Determining data sufficiency for calculating ages

Analyze the given sequence string[cite: 1407, 1408]. The text contains a repeating structure built out of the 4-letter block `A B C D`. Notice the layout at the end: `...ABCDABCD`. This confirms the underlying base block size is exactly 4.

Let's write out the string by segmenting it into uniform chunks of 4 characters: Block 1: `A B C D` Block 2: `_ B B C` (based on `_BBCD...`) Block 3: `D A B C` (based on `...CDABCD...`) Block 4: `D A B C` (based on the ending `...ABCD`)

Wait, notice a secondary alignment. The problem transcription shows `ABCD_BBCDABCDABCD`. Let's match the exact letter indices from the Hindi translation layout which often clarifies hidden spaces: `A_BCD_BBCDABC_DABC_D`.

Let's re-examine using the 20-character sequence from the bilingual print check: `A _ B C | D _ B B | C D A B | C _ D A | B C _ D` Let's match a uniform cyclic shift or a steady block replication: If the pattern is a simple looping block `A B C D`:

This maps perfectly to the 4 blanks sequence. Let's trace option (b): `B, A, C, D`. Plugging these in yields `ABCD` repeated cleanly: `ABCD | ABCD | ABCD | ABCD | ABCD`.

Answer: (b).