- AStatement I alone is sufficient but Statement II alone is not
- BStatement II alone is sufficient but Statement I alone is not
- CEither statement alone is sufficient
- DBoth statements together are needed (neither alone is sufficient)
Step-by-Step Solution
From I, X married Y's daughter, so X is Y's son-in-law. From II, X could be Y's son (grandson via a son) or son-in-law (grandson via a daughter), which is ambiguous.
Answer: A) Statement I alone is sufficient but Statement II alone is not