In the chemical equation, $w$, $x$, $y$ and $z$ are each whole numbers. $w\text{ClO}_3^- + x\text{MnO}_4^- + y\text{H}^+ \rightarrow w\text{ClO}_4^- + x\text{MnO}_2 + z\text{H}_2\text{O}$ After the equation has been balanced, what are the values of $w$, $x$ and $y$?
- A$w=1, x=1, y=2$
- B$w=2, x=2, y=2$
- C$w=2$ , $x=3$ , $y=8$
- D$w=3, x=2, y=2$