What should come in place of question mark (?) in the following number/alphabetic series? A I L , C L P , E O T, ?

What should come in place of question mark (?) in the following number

1.	What should come in place of question mark (?) in the following number/alphabetic series? A I L , C L P , E O T, ?
A.	F R X
B.	F R Y
C.	G R X
D.	G R Y
Answer» D. G R Y