Is A the mother of C? I. B is the husband of A. II. C is the daughter of B. III. D is the brother of C.

Statement I alone is sufficient.
Statements I and II together are sufficient.
Statements II and III together are sufficient.
Statement III is alone sufficient.

Correct answer: Statements I and II together are sufficient.

Solution

Statement I only tells us B is A’s husband, which is not enough. Statement II says C is the daughter of B; combined with Statement I, this implies A is also C’s mother. Therefore, I and II together are sufficient.

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