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