Select the term that will come next in the following series.
BDf, GIk, LNp, _________.
Answer & explanation
Correct answer: option 1

Explanation:
BDf, GIk, LNp, _________.
The logic followed here is :
B → (+5) → G → (+5) → L → (+5) → Q
D → (+5) → I → (+5) → N → (+5) → S
F → (+5) → K → (+5) → P → (+5) → u
So, the letter-cluster that replaces the (?) to complete the series is "QSu"