Solve for the Indicated Variable $C = 2 \pi r$ For $r$

Multiple Choice

Solve for the indicated variable. $C = 2 \pi r$ for $r$

A) $r = \frac { 2 C } { \pi }$
B) $r = \frac { C } { 2 \pi }$
C) $r = \frac { \pi } { 2 C }$
D) $r = \frac { 2 \pi } { C }$