- 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
From I, P is a son of Q's father, so P is Q's brother (definite). From II, P and Q share a mother but P's gender is unknown, so P could be brother or sister.
Answer: C) Statement I alone is sufficient but Statement II alone is not