Find the Most General Antiderivative $$\int \left( 6 x ^ { 3 } + 9 x + 2 \right) d x$$

Multiple Choice

Find the most general antiderivative.
- $$\int \left( 6 x ^ { 3 } + 9 x + 2 \right) d x$$

A) $18 x ^ { 4 } + 18 x ^ { 2 } + 2 x + C$
B) $18 x ^ { 2 } + 9 + C$
C) $6 x ^ { 4 } + 9 x ^ { 2 } + 2 x + C$
D) $\frac { 3 } { 2 } x ^ { 4 } + \frac { 9 } { 2 } x ^ { 2 } + 2 x + C$