If P + Q means P is the father of \[\text{Q, P }\!\!\times\!\!\text{ Q}\]means P is the brother of Q, P - Q means P is the mother of Q, then which of the following is definitely true about C - A + B?

• A.  B is the son of A
• B.  A is the son of C
• C.  B is the father of A
• D.  C is the mother of B