I is the niece of J means the following - J's sibling ( brother or sister ) 's daughter is I.
So I is the daughter of someone ( let us call it as C ). So it is represented as I + C
C is the brother or sister of J. That is represented as C - J or C * J.
So it should be I + C - J or I + C * J

[A]. J - N % C x I
[B]. I x C - N % J
[C]. J + M x C % I
[D]. I x C + N - J @

Answer : D

Explanation:
I x C → I is the sister of C

C + N → C is the daughter of N

and N - J → N is the brother of I.

I is niece of J.