Solve the Equation for the Indicated Variable $r= \pm \sqrt{\frac{A}{2 \pi}}$

Multiple Choice

Solve the equation for the indicated variable.
- $r= \pm \sqrt{\frac{A}{2 \pi}}$ for $A$

A) $A=2 \pi r$
B) $\mathrm{A}= \pm 2 \pi \sqrt{\mathrm{r}}$
C) $\mathrm{A}= \pm \sqrt{2 \pi \mathrm{r}}$
D) $\mathrm{A}=2 \pi \mathrm{r}^{2}$