Select the letter-cluster that can replace the question mark (?) in the following series.
MRT, TYA, AFH, HMO, ?
Answer & explanation
Correct answer: option 3

Explanation:
MRT, TYA, AFH, HMO, ?
The logic followed here is :
M → (+7) → T → (+7) → A → (+7) → H → (+7) → O
R → (+7) → Y → (+7) → F → (+7) → M → (+7) → I
T → (+7) → A → (+7) → H → (+7) → O → (+7) → V
So, the letter-cluster that replaces the (?) to complete the series is "OIV"