Factor the Polynomial Completely $3 x ^ { 7 } + 3 x ^ { 8 } + 3 x ^ { 5 }$

Multiple Choice

Factor the polynomial completely. $3 x ^ { 7 } + 3 x ^ { 8 } + 3 x ^ { 5 }$

A) $3 x ^ { 5 } \left( x ^ { 2 } + x ^ { 3 } + 3 \right)$
B) $3 x ^ { 5 } \left( x ^ { 2 } + x ^ { 3 } + x \right)$
C) $3 x ^ { 5 } \left( x ^ { 2 } + x ^ { 4 } + x \right)$
D) $3 x ^ { 5 } \left( x ^ { 2 } + x ^ { 3 } \right)$
E) $3 x ^ { 5 } \left( x ^ { 2 } + x ^ { 3 } + 1 \right)$