Explanation:

From the above option (B)EGIKM (C) BDFHJ (D) QSUWY
the above three followed the same pattern given below
We know that A=1, B=2, C=3, D=4 ..... Z=26
then (B) 5 7 9 11 13 every alphabet difference 2 alphabet position increase left to Right.
(C) 2 4 6 8 10 every alphabet difference 2 alphabet position increase left to Right.
(D) 17 19 21 23 25 every alphabet difference 2 alphabet position increase left to Right.
but the option does not follow that pattern
(A) NOQST wrote in the form of alphabet position 14 15 17 19 20 it difference increase left to Right 1, 2, 2, 1
therefore option (A) NOQST is different from to the another given option
Ans = NOQST