Four-letter sliding window from C – UGC NET Question

Each term is a set of four consecutive letters, and the starting letter of each group increases by one: C, D, E, F. After FGHI, the next group must start with G, the next letter after F, and continue with H, I and J. Thus GHIJ is the only group that continues the sliding window pattern correctly.

Option A:
Option A is correct because it starts at G and includes the next three consecutive letters H, I and J. This maintains the group length, keeps the letters consecutive, and advances the starting position by exactly one step. These are the key features seen consistently in the earlier terms of the series.

Option B:
Option B, HIJK, begins at H, which would be the group after GHIJ rather than the immediate successor to FGHI. It therefore shifts the starting letter too far forward by skipping the block beginning at G. Because the pattern never skips a position, HIJK cannot be the correct answer.

Option C:
Option C, IJKL, moves even further ahead and ignores both the immediate G and H starting positions. It would represent a later block in the theoretical continuation, not the next one. Since the question asks for the very next term, IJKL is not appropriate.

Option D:
Option D, JKLM, similarly represents a block starting even later in the alphabet. It discards the incremental nature of the starting letters that has been established. For that reason, JKLM does not provide the correct continuation of the given series.