Add the Polynomials $$\left( 9 x ^ { 3 } + 5 x + 7 \right) + \left( 8 x ^ { 2 } + 4 x + 5 \right)$$

Multiple Choice

Add the polynomials.
- $$\left( 9 x ^ { 3 } + 5 x + 7 \right) + \left( 8 x ^ { 2 } + 4 x + 5 \right)$$

A) $17 x ^ { 3 } + 9 x + 12$
B) $17 x ^ { 3 } + 13 x ^ { 2 } + 7 x + 5$
C) $9 x ^ { 3 } + 13 x ^ { 2 } + 11 x + 5$
D) $9 x ^ { 3 } + 8 x ^ { 2 } + 9 x + 12$