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Data Sufficiency — how is A related to D? (family link via B) Statements: I. B is the brother of A. II. B is D's son. Choose the correct sufficiency option.

Difficulty: Easy

I alone is sufficient while II alone is not sufficient
II alone is sufficient while I alone is not sufficient
Either I or II is sufficient
Neither I nor II is sufficient

Correct Answer: Neither I nor II is sufficient

Explanation:

Reasoning
I: B is A's brother ⇒ A's relation to D unknown. II: B is D's son ⇒ A not mentioned. Together: B is both A's brother and D's son, so A is also a child of D (son or daughter). The type of relation (child) can be concluded only when both statements are used.

Answer per data-sufficiency choices
Neither I nor II is sufficient individually. (Both together identify A as D's child.)

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