Find the Moment or Center of Mass of the Wire $x$

Multiple Choice

Find the moment or center of mass of the wire, as indicated.
-Find the moment about the $x$ -axis of a wire of constant density that lies along the first-quadrant portion of the circle $x ^ { 2 } + y ^ { 2 } = 16$ .

A) 4
B) $\frac { 8 } { \pi }$
C) $\frac { 4 } { \pi }$
D) 16