- 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
Statement I says P is a son (male) of Q's father, so P is Q's brother — sufficient. Statement II only makes P and Q siblings without fixing P's gender, so P could be brother or sister — not sufficient.
Answer: C) Statement I alone is sufficient but Statement II alone is not