Find the ODD one out from the given options.

Correct option is C

ILOR: I (9), L (12), O (15), R (18)
The pattern here is: +3 between consecutive letters.
GJMP:
G (7), J (10), M (13), P (16)
The pattern here is also: +3 between consecutive letters.
FILN: F (6), I (9), L (12), N (14)
The pattern here is: +3, +3, +2 (between L and N).
HKNQ: H (8), K (11), N (14), Q (17)
The pattern here is: +3 between consecutive letters.
Conclusion:
In the series FILN, the pattern breaks as the last two letters have a difference of +2 instead of +3.
Odd one out: (c) FILN