Use the Difference of Squares Pattern to Factor the Polynomial $x ^ { 2 } - 9 y ^ { 2 }$

Multiple Choice

Use the difference of squares pattern to factor the polynomial. $x ^ { 2 } - 9 y ^ { 2 }$

A) ( x - 9 y ) ( x + 9 y )
B) ( x + 3 y ) ( x + 9 y )
C) ( x - 3 y ) ( x + 3 y )
D) ( x - 3 y ) ( x - 9 y )
E) none of these