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$$r=\sqrt{x^{2}+y^{2}}$$$\newline$The equation gives the quantity $r$ in terms of the quantities $x$ and $y$. Which of the following equations gives a possible value of $x$ in terms of $r$ and $y$ ?$\newline$Choose $1$ answer:$\newline$(A) $x=\sqrt{r^{2}}-y^{2}$$\newline$(B) $x=\sqrt{r^{2}-y^{2}}$$\newline$(C) $x=\sqrt{r^{2}+y^{2}}$$\newline$(D) $x=r-y$