If A + B means A is the sister of B, and A - B means A is the mother of B, what does P

If "A + B" means A is the sister of B, and "A - B" means A is the mother of B, what does "P - Q + R" mean?

A. P is the mother of Q and R is Q's sister.

B. P is the mother of Q and R is P's daughter.

C. P is the mother of Q and R is Q's brother.

D. P is the mother of Q and R is Q's aunt.

"P - Q" means P is Q's mother, and "Q + R" means Q is R's sister. Combining, P is the mother of Q, and R is Q's sister.

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