Write an Equation of the Circle with the Given Center $\sqrt { 13 }$

Multiple Choice

Write an equation of the circle with the given center and radius.
-the origin; $\sqrt { 13 }$

A) $x ^ { 2 } + y ^ { 2 } = 169$
B) $x ^ { 2 } + y ^ { 2 } = \sqrt { 13 }$
C) $x ^ { 2 } + y ^ { 2 } = 13$
D) $x ^ { 2 } + y ^ { 2 } = \frac { 13 } { 4 }$