$A + B$ means $A$ is the daughter of $B$. $A - B$ means $A$ is the husband of $B$. $A \times B$ means $A$ is the brother of $B$.
If $P + Q - R$,which of the following is true?

• A
  $R$ is the mother of $P$
• B
  $R$ is the sister-in-law of $P$
• C
  $R$ is the aunt of $P$
• D
  $R$ is the mother-in-law of $P$