Factor by Grouping $x^{3}+7 x^{2}-3 x-21$ A) $(x+7)\left(x^{3}-3 x\right)$ B) $\left(x^{2}+7\right)(x-3)$ C) $(x+7)\left(x^{2}-3\right)$ D) $(x-7)\left(x^{2}-3\right)$

Multiple Choice

Factor by grouping.
- $x^{3}+7 x^{2}-3 x-21$

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