What should come in place of the question mark (?) in the given series based on the English alphabetical order?
EON HMO KKP NIQ ?

Correct option is C

Given series:
EON, HMO, KKP, NIQ, ?
Logic: 1st letter +3, 2nd letter -2 and 3rd letter +1 

First letters:
E → H → K → N → ?
E (5) → H (8) → K (11) → N (14) → Q (17)
First letter = Q
Second letters:
O → M → K → I → ?
O (15) → M (13) → K (11) → I (9) → G (7)
Second letter = G
Third letters:
N → O → P → Q → ?
N (14) → O (15) → P (16) → Q (17) → R (18)
Third letter = R
Correct answer is (c): Q G R