Parallel shift four letter groups – UGC NET Question

In this series, each new group is obtained by shifting every letter of the previous group one step forward in the alphabet. ACDF becomes BDEG, then CEFH, then DFGI by this uniform +1 movement in all positions. Applying the same rule once more, D becomes E, F becomes G, G becomes H and I becomes J. Therefore EGHJ is the only group that correctly continues the pattern.

Option A:
Option A is correct because it preserves the exact transformation seen between all consecutive terms. Every letter is increased by one step from the previous group DFGI, giving E, G, H and J in order. This keeps the structure and spacing of the letters unchanged, so EGHJ fits perfectly as the next term.

Option B:
Option B, EGHI, keeps the first three letters correctly but leaves the last letter as I instead of advancing it to J. This breaks the rule that every position must move forward by one step. Because the last letter does not follow the established shift, EGHI cannot be accepted as the next term.

Option C:
Option C, EFGJ, changes the second letter incorrectly to F, which does not come from shifting F in the previous group. It also disturbs the internal spacing between letters, which has been maintained in all earlier terms. Since it fails to apply the uniform +1 movement to every position, EFGJ does not fit the series.

Option D:
Option D, FGHI, looks like a familiar consecutive pattern but is not derived from DFGI by adding one to each letter. It replaces D with F, which is a jump of two positions, and creates a different spacing between letters. As it does not follow the consistent transformation rule, FGHI is not the correct continuation.