A and B are children of D. Who is the father of A? To answer this question which

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Question
A and B are children of D. Who is the father of A? To answer this question which of the statements (1) and (2) is necessary?
1. C is the brother of A and the son of E.
2. F is the mother B.
Options
A. Only (1)
B. Only (2)
C. Either (1) or (2)
D. (1) and (2) both

Correct Answer

Only (2)

Explanation

A and B are children of D.

From (1), C is the brother B and son of E.

Since, the sex of D and E are not known. Hence (1) is not sufficient to answer the question.

From (2). F is the mother of B. Hence, F is also the mother of A. Hence D is the father of A.

Thus, (2) is sufficient to answer the question.