Perform the Indicated Operations and Simplify $$\begin{array} { r } 8 x ^ { 7 } + 4 x ^ { 6 } + 4 x \\+ \left( 2 x ^ { 7 } + 4 x ^ { 6 } + 2 x \right) \\\hline\end{array}$$

Multiple Choice

Perform the indicated operations and simplify.
- $$\begin{array} { r } 8 x ^ { 7 } + 4 x ^ { 6 } + 4 x \\+ \left( 2 x ^ { 7 } + 4 x ^ { 6 } + 2 x \right) \\\hline\end{array}$$

A) $10 x + 8 x ^ { 7 } + 6 x ^ { 6 }$
B) $24 \mathrm { x } ^ { 14 }$
C) $6 x ^ { 7 } + 12 x ^ { 6 } + 6 x$
D) $10 x ^ { 7 } + 8 x ^ { 6 } + 6 x$