Factor the Polynomial Completely $$a ^ { 2 } + 3 a b - 28 b ^ { 2 }$$

Multiple Choice

Factor the polynomial completely.
- $$a ^ { 2 } + 3 a b - 28 b ^ { 2 }$$

A) $( a - 7 b ) ( a + b )$
B) $( a - b ) ( a + 4 b )$
C) $( a - 7 b ) ( a + 4 b )$
D) $( a + 7 b ) ( a - 4 b )$