Find the Sum or Difference $$\left( 6 n ^ { 5 } + 9 n + 7 n ^ { 2 } \right) + \left( 3 n ^ { 2 } + 4 n ^ { 5 } + 3 n \right)$$

Multiple Choice

Find the sum or difference.
- $$\left( 6 n ^ { 5 } + 9 n + 7 n ^ { 2 } \right) + \left( 3 n ^ { 2 } + 4 n ^ { 5 } + 3 n \right)$$

A) $13 n ^ { 5 } + 9 n ^ { 2 } + 10 n$
B) $10 n + 10 n ^ { 5 } + 12 n ^ { 2 }$
C) $32 n ^ { 8 }$
D) $10 n ^ { 5 } + 10 n ^ { 2 } + 12 n$