How many sons does D have ?
Statements:
1. A's father has three children.
2. B is A's brother and son of D.

I alone is sufficient while II alone is not sufficient

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II alone is sufficient while I alone is not sufficient

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Either I or II is sufficient

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Neither I nor II is sufficient

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Both I and II are sufficient

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Solution

The correct option is B Neither I nor II is sufficient
From both I and II together, we can conclude that A and B are the children of D, but the sex of A and the third child of D is not known. So, both I and II together are also not sufficient to answer the question.

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