Factor Completely $21 x^{3}-91 x^{2}-70 x$ A) $\left(x^{2}-5\right)(21 x+14)$ B) $7 x(3 x+2)(x-5)$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write "prime."
- $21 x^{3}-91 x^{2}-70 x$

A) $\left(x^{2}-5\right) (21 x+14)$
B) $7 x(3 x+2) (x-5)$
C) $x(3 x+2) (7 x-35)$
D) $7(3 x-2) (x+5)$