Simplify the Polynomial by Combining Like Terms $$4 x + 4 x ^ { 3 } + 8 x ^ { 3 } + 9 x$$

Simplify the polynomial by combining like terms.
- $$4 x + 4 x ^ { 3 } + 8 x ^ { 3 } + 9 x$$

A) $12 x ^ { 3 } + 13 x$
B) $25 \mathrm { x } ^ { 3 }$
C) $4 x + 4 x ^ { 3 } + 8 x ^ { 3 } + 9 x$
D) $25 x$