The oxide of a metal $(R)$ can be reduced by the metal $(P)$,and metal $(R)$ can reduce the oxide of metal $(Q)$. Then the decreasing order of the reactivity of metals $(P)$,$(Q)$,and $(R)$ with oxygen is:
- A$P > Q > R$
- B$P > R > Q$
- C$R > P > Q$
- D$Q > P > R$
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