The oxidation states of $P$ in $PO_4^{3-}$,$S$ in $SO_4^{2-}$,and $Cr$ in $Cr_2O_7^{2-}$ are respectively:
- A$+3, +6, +5$
- B$+5, +3, +6$
- C$-3, +6, +6$
- D$+5, +6, +6$
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