Select the option that represents the letters that, when placed from left to right in the same sequence in the blanks below; will complete the letter series.
I_ LO_RUVX_B_ G​​

I _ L O _ R U V X _ B _  G

Logic:  In this series each number is increasing by  +1, +2,  

Solution: 

By option : 

Option (a)  JRAD  ( In this option the logic is not follow)

I J L O R R U V X A B D G  

Option (b) JPXD  ( In this option the logic is not follow) 

I J L O P R U V X X B D G 

Option (c) JPAG  ( In this option the logic is not follow) 

I J L O P R U V X A B G G

Option (d) JPAD  ( In this option the logic is follow ) 

I J L /OPR /U V X /ABD /G

Thus, the correct option is (d)    J,  P, A, D.