17. Which is the factored form of
g(x) = x3 - 21x - 20 ?
A g(x)=(x - 1)(x + 4)(x + 5)
B g(x)=(x + 1)(x + 4)(x-5)
C g(x) = (x + 1)(x - 4)(x+5)
D g(x) = (x - 1)(x-4)(x-5)