Three letter parallel shift series – UGC NET Question

Each new group is formed by adding +1 to every letter: CAM→DBN→ECO→FDP. Next is FDP shifted to GEQ.

Option A:
Option A changes the second letter incorrectly and does not apply +1 uniformly.

Option B:
Option B uses D as the middle letter, which is not +1 from D in FDP (it should become E).

Option C:
Option C ends with R, which is +2 from P, not +1.

Option D:
Option D is correct because F→G, D→E, P→Q.