Letter group series ABC BCD CDE DEF – UGC NET Question

Each group is a block of three consecutive letters, and each new group starts one letter later than the previous one: ABC (1–3), BCD (2–4), CDE (3–5) and DEF (4–6). Following this sliding pattern, the next block should be 5–7, which is EFG. Thus EFG is the only group that continues the shifting window of three letters.

Option A:
Option A is correct because it begins at E, the letter after D, and includes the next two letters F and G. This matches the structure of overlapping three-letter blocks. EFG therefore maintains both the length and the shifting start of the groups.

Option B:
Option B, FGH, starts at F instead of E, pushing the window too far forward. This would skip the block starting with E that the pattern demands. As a result, FGH does not fit the immediate continuation of the series.

Option C:
Option C, GHI, moves even further ahead, starting at G. It ignores the systematic one-letter shift in the starting position. Because the series does not skip starting letters, GHI cannot be the next term.

Option D:
Option D, BCD, repeats an earlier block rather than providing a new one. The pattern clearly produces new overlapping groups, not repetitions. Hence BCD is not a valid continuation.