|A) If the data in statement I alone are sufficient to answer the question||B) If the data in statement II alone are sufficient answer the question|
|C) If the data either in I or II alone are sufficient to answer the question;||D) If the data in both the statements together are needed.|
From both the statements together, we find that D is the father of B and B is the brother of A. So,
D is the father of A.
Thus, both the given statements are needed.