If Possible, Factor the Polynomial Completely $49 - x ^ { 2 } y ^ { 2 }$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $49 - x ^ { 2 } y ^ { 2 }$

A) $( 7 + x y ) ^ { 2 }$
B) $49 - x ^ { 2 } y ^ { 2 }$
C) $( 7 - x y ) ( 7 + x y )$
D) $( 7 - x y ) ^ { 2 }$