In the balanced reaction $x\,MnO_4^- + y\,H_2O \to 2Mn^{2+} + 5H_2O + 9O_2 + z\,e^-$,what are the values of $x$,$y$,and $z$?
- A$2, 5, 6$
- B$5, 2, 9$
- C$3, 5, 5$
- D$2, 6, 6$
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