Perform the Indicated Operations and Simplify $$\left( 8 x ^ { 5 } + 9 x ^ { 4 } \right) + \left( 5 x ^ { 5 } - 3 x ^ { 4 } \right)$$

Multiple Choice

Perform the indicated operations and simplify.
- $$\left( 8 x ^ { 5 } + 9 x ^ { 4 } \right) + \left( 5 x ^ { 5 } - 3 x ^ { 4 } \right)$$

A) $19 x ^ { 9 }$
B) $13 x ^ { 10 } + 6 x ^ { 8 }$
C) $13 x ^ { 5 } + 6 x ^ { 4 }$
D) $19 x ^ { 18 }$