Replace the Cartesian Equation with an Equivalent Polar Equation $$x ^ { 2 } + y ^ { 2 } = 100$$

Multiple Choice

Replace the Cartesian equation with an equivalent polar equation.
- $$x ^ { 2 } + y ^ { 2 } = 100$$

A) $r = 10 \sin \theta$
B) $r = 100$
C) $r = 10$ or $r = - 10$
D) $r = 10 \cos \theta$