Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
CUH, HQK, MMN, RIQ, ?
Answer & explanation
Correct answer: option 3

Explanation:
CUH, HQK, MMN, RIQ, ?
The logic followed here is :
C → (+5) → H → (+5) → M → (+5) → R → (+5) → W
U → (-4) → Q → (-4) → M → (-4) → I → (-4) → E
H → (+3) → K → (+3) → N → (+3) → O → (+3) → T
So, the letter-cluster that replaces the (?) to complete the series is "WET"