Factor the Trinomial Completely $x ^ { 3 } - x ^ { 2 } - 20 x$

Multiple Choice

Factor the trinomial completely. If the polynomial cannot be factored, write "prime."
- $x ^ { 3 } - x ^ { 2 } - 20 x$

A) $x ( x + 4 ) ( x - 5 )$
B) $\left( x ^ { 2 } + 1 \right) ( x - 20 )$
C) $x ( x + 5 ) ( x - 4 )$
D) prime