Factor the Trinomial Completely $4 r ^ { 6 } - 8 r ^ { 5 } - 32 r ^ { 4 }$

Multiple Choice

Factor the trinomial completely. If the polynomial cannot be factored, write "prime."
- $4 r ^ { 6 } - 8 r ^ { 5 } - 32 r ^ { 4 }$

A) $\left( 4 \mathrm { r } ^ { 3 } + 16 \right) ( \mathrm { r } - 2 )$
B) $4 r ^ { 4 } ( r + 2 ) ( r - 4 )$
C) $4 r ^ { 4 } ( r - 2 ) ( r + 4 )$
D) $\left( 4 \mathrm { r } ^ { 3 } + 8 \right) ( \mathrm { r } - 4 )$