The correct option is A BFIK
In First group letters are 4,6, 9, and 13 position from left
In Second group letters are 4, 8, 11, 13 position from right
In Fourth group letters are 2, 4,7 ,11 position from right
Similarly Third group letters will be 2,6,9, 11 position from left
Hence BFIK is right answer