- 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 makes R a child of P but leaves R's gender open (Q being R's sister doesn't fix it), so it is insufficient. II states R is P's son — sufficient.
Answer: B) Statement II alone is sufficient but Statement I alone is not