Factor the Polynomial Completely $5 a ^ { 2 } + 5 a b - 7 a - 7 b$

Multiple Choice

Factor the polynomial completely. If the polynomial cannot be factored, write "prime."
- $5 a ^ { 2 } + 5 a b - 7 a - 7 b$

A) $( 5 a + 7 ) ( a - b )$
B) $( 5 a - 7 ) ( a - b )$
C) $( 5 a + 7 ) ( a + b )$
D) $( 5 a - 7 ) ( a + b )$