Letter group series ABCD BCDE CDEF DEFG – UGC NET Question

Each term is a block of four consecutive letters, and the block slides one position to the right each time: ABCD (1–4), BCDE (2–5), CDEF (3–6), DEFG (4–7). The next block must start at position 5 and cover 5–8, which is EFGH. Thus EFGH uniquely continues the sliding four-letter window.

Option A:
Option A, FGHI, is a valid four-letter block but starts at F, thereby skipping the block that should start at E. The series does not skip intermediate starting positions. Therefore FGHI is too far ahead to be the next term.

Option B:
Option B, EFGJ, begins correctly at E but breaks the requirement that letters inside the block be consecutive. J does not follow G directly. As a result, EFGJ does not maintain the strictly consecutive nature of the blocks.

Option C:
Option C, DEFG, repeats the last given term. The pattern clearly moves forward by one starting letter at each step. Since no repetition rule is indicated, DEFG cannot be the next term.

Option D:
Option D is correct because it starts at E, the letter immediately after D, and continues with F, G and H in order. It preserves both the block length and the consecutiveness of letters. Consequently, EFGH is the proper continuation of the series.