the position of `i` is 9. so w.r.t. function C(i) = (7*9+13)MOD 26 = 24 which is X. so option D should be correct.

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Answer is A

See A=0 B=1 C=2 .......... you will get I = 8 ................

Now you just apply the cipher function character wise ,

BY THE WAY IN THE ABOVE FUNCTION M STANDS FOR 1 character one by one of input

So our first character is I

C( I ) = ( KM+13) MOD 26 =(7*8+13)MOD 26 = 17 and if you see 17 is R value

So just from the first character you can get answer RJCH

See A=0 B=1 C=2 .......... you will get I = 8 ................

Now you just apply the cipher function character wise ,

BY THE WAY IN THE ABOVE FUNCTION M STANDS FOR 1 character one by one of input

So our first character is I

C( I ) = ( KM+13) MOD 26 =(7*8+13)MOD 26 = 17 and if you see 17 is R value

So just from the first character you can get answer RJCH

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