Select the term that will come next in the following series.
BY, CX, EV, HS, ______
Answer & explanation
Correct answer: option 4

Explanation:
BY, CX, EV, HS, ______
The logic followed here is :
B → (+1) → C → (+2) → E → (+3) → H → (+4) → L
Y → (-1) → X → (-2) → V → (-3) → S → (-4) → O
So, the letter-cluster that replaces the (?) to complete the series is "LO"