Select the option that is different from the rest.​​

given options:

Following the logic is :The pattern based on opposite letters in the alphabet.

check each pair:

R ↔ I → R (18) is opposite to I (9) 

L ↔ P → L (12) is opposite to O (15), NOT P (16) 

H ↔ S → H (8) is opposite to S (19) 

P ↔ K → P (16) is opposite to K (11) 

L and P are NOT opposite letters, option B (LP) is the odd one out.

Thus the correct answer is: Option B