The correct option is D Cannot be determined
(i) B is the son of C, but C is not the mother of B implies that C is the father of B
(ii) A and C are married couple means that A is the mother of B, and A and C are husband and wife.
(iii) E is the brother of C implies that E is uncle of B.
(vi) D is the daughter of A implies that D and B are brother and sister.
(v) F is the brother of B implies that D, F and B are siblings or A has three children in all.
In the above data there isn't any description of E's wife.
Hence, it can't be determined.