Solve for the Indicated Variable $A = 2 \pi a ^ { 2 }$

Multiple Choice

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

A) $a = \sqrt { 2 \pi \mathrm { A } }$
B) $a = \frac { \pm A \sqrt { 2 \pi } } { 2 \pi }$
C) $a = \frac { \pm \sqrt { 2 \pi \mathrm { A } } } { 2 \pi }$
D) $a = \frac { \pm \sqrt { \mathrm { A } \pi } } { 2 }$