Without knowing the gender of C, we can’t be determined whether B is sister of C or B is brother of C.

Correct Option: D

Without knowing the gender of C, we can’t be determined whether B is sister of C or B is brother of C. Similarly without knowing the gender of B we can’t be determined whether C is sister of B or C is brother of B.
Therefore, both (i) and (ii) are necessary.

Clearly, only daughter of her mother is woman herself.

Correct Option: B

Clearly, only daughter of her mother is woman herself. So, that woman is the wife of man.

Clearly, the lady is the grandmother of man’s sister’s son i.e., the mother of the mother of man’s sister’s son.

Correct Option: C

Clearly, the lady is the grandmother of man’s sister’s son i.e., the mother of the mother of man’s sister’s son i.e., the mother of man’s sister.
So, the lady is man’s mother.

Since the narrator has no brother, his father’s son is he himself. So, the man who was talking is the father of the man in the photograph.

Correct Option: B

Since the narrator has no brother, his father’s son is he himself. So, the man who was talking is the father of the man in the photograph, i.e. the man in the photograph is his son.

Girl is daughter of the only child of Abhishek’s father or, Girl is daughter of Abhishek.

Correct Option: B

Girl is daughter of the only child of Abhishek’s father or, Girl is daughter of Abhishek.
Hence, girl is daughter of Abhisek’s wife.