Question

There are nine members in three generations and three married couples in the family. There are only four male members in the family. K is son of N who is daughter-in-law of J. C is father of
A. L is mother of M who is father of O. M is son-in-law of
B. A is unmarried and aunt of O. C is not married to
L.How O is related to A?

A Nephew
B Son
C Niece
D Sister
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