A is sister of B. How are B and D related to each

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Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and

A is sister of B. How are B and D related to each other ?
I. D is brother of B.
II. F is sister of D.

[SBI PO 2017]

A Give answer (A) if the data in statements I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.

B Give answer (B) if the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.

C Give answer (C) if the data either in statement I alone or in statement II alone are sufficient to answer the question.

D Give answer (D) if the data given in both statements I and II together are not sufficient to answer the question.

E Give answer (E) if the data in both the statements I & II together are necessary to answer the question.