the series goes like +2,-1,+1
A B C D E F G
H I J K LÂ M N
O P Q R S TÂ
U V W X Y Z
So for every first letter in the group of letters we add +2 making a series like J,M,P,S,V
    J +2=M (J K L than M)
and for every second letter in the group of letter we go one letter back that is -1 making the series V,T,R,P,N
V-1=T (T U AND V)
now for the third letter in the group of letters we do +1Â making the series D,F,H,J,L
D+1=F (D E AND F)
So doing this the answer we get is SPJ that is option A
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