Solve the Equation for the Indicated Variable $A=\pi r^{2}$ For $r$ A) $r=A \pi$

Multiple Choice

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

A) $r=A \pi$
B) $r=\frac{A}{\pi}$
C) $r= \pm \sqrt{\frac{A}{\pi}}$
D) $r= \pm \sqrt{\frac{\pi}{A}}$