- ABoth statements together are needed (neither alone is sufficient)
- BStatement II alone is sufficient but Statement I alone is not
- CEither statement alone is sufficient
- DStatement I alone is sufficient but Statement II alone is not
Step-by-Step Solution
I: X is the son of Y's brother, so X is Y's nephew — sufficient. II only shows X's parent is a sibling of Y, and X's gender is unknown (nephew or niece), so it is insufficient.
Answer: D) Statement I alone is sufficient but Statement II alone is not