- ABoth statements together are needed (neither alone is sufficient)
- BStatement II alone is sufficient but Statement I alone is not
- CStatement I alone is sufficient but Statement II alone is not
- DEither statement alone is sufficient
Step-by-Step Solution
I makes D a child of A but leaves the gender open (son or daughter), so it is insufficient. II makes D the daughter of A's wife, i.e. A's daughter.
Answer: B) Statement II alone is sufficient but Statement I alone is not