If $$A - B$$ means that A is the mother of B, $$A + B$$ means that A is the father of B, $$A \div B$$ means that A is the sister of B, then which of the following expression shows that P is the aunt of Q?

A

$$P \div R + Q$$

B

$$P \div R - Q$$

C

$$P + R \div Q$$

D

$$R \div P - Q$$