Find the Difference of the Polynomials $\begin{array} { l } x ^ { 4 } + 7 x ^ { 3 } + 5 x - 7 \\- \left( - 3 x ^ { 3 } + 2 x + 7 \right)\\\hline\end{array}$

Multiple Choice

Find the difference of the polynomials. $\begin{array} { l } x ^ { 4 } + 7 x ^ { 3 } + 5 x - 7 \\- \left( - 3 x ^ { 3 } + 2 x + 7 \right) \\\hline\end{array}$

A) $x ^ { 4 } + 10 x ^ { 3 } + 3 x - 14$
B) $x ^ { 4 } + 10 x ^ { 3 } + 7 x - 14$
C) $x ^ { 4 } + 10 x ^ { 3 } + 3 x + 14$
D) $x ^ { 4 } + 4 x ^ { 3 } + 3 x + 14$
E) $x ^ { 4 } + 4 x ^ { 3 } + 7 x + 14$