Factor Completely

Multiple Choice

Factor completely. If unfactorable, indicate that the polynomial is prime.
-(a + b) x² - 4(a + b) x - 60(a + b)

A) (a + b) (x + 6) (x - 10)
B) prime
C) (ax + 6b) (ax - 10b)
D) (a +b) (x - 6) (x + 10)