Step 1: Extract relationships from the statements

• Statement-1: P has two sisters R and S. → P, R, S are siblings. The gender of P is not specified; P could be brother or sister.

• Statement-2: R's father is the brother of Q. → R's father and Q are siblings. Therefore Q is a sibling of R's father, so Q is an aunt or uncle of R (gender of Q unknown). Since P is a sibling of R, Q is also an aunt or uncle of P.

Step 2: Determine whether the relation is fully specified

• Combining both statements, we know Q is an aunt/uncle of P (i.e., a parental sibling of P).
• But the precise label (aunt vs. uncle) depends on Q's gender, which is not given anywhere.
• Also Statement-1 or Statement-2 alone do not suffice to conclude that Q is a parental sibling of P; only together they show Q is a sibling of P's father (hence aunt/uncle).

Step 3: Answer choice logic

• Even with both statements, we cannot determine whether Q is an aunt (female) or an uncle (male) — the exact relation cannot be uniquely specified.
• Therefore the question cannot be answered (uniquely) even using both statements.

Hence option (D) is correct.