Select the letter-cluster that can replace the question mark (?) in the following series.
eBd, hXi, kTn, nPs, ?
Answer & explanation
Correct answer: option 3

Explanation:
eBd, hXi, kTn, nPs, ?
The logic followed here is :
e → (+3) → h → (+3) → k → (+3) → n → (+3) → q
B → (-4) → X → (-4) → T → (-4) → P → (-4) → L
d → (+5) → i → (+5) → n → (+5) → s → (+5) → x
So, the letter-cluster that replaces the (?) to complete the series is "qLx"