Add or Subtract as Indicated $\left(7+5 x^{6}+9 x^{8}-2 x^{7}\right)+\left(-9 x^{7}-2 x^{6}-4+4 x^{8}\right)$

Multiple Choice

Add or subtract as indicated.
- $\left(7+5 x^{6}+9 x^{8}-2 x^{7}\right) +\left(-9 x^{7}-2 x^{6}-4+4 x^{8}\right)$

A) $-2 x^{8}-2 x^{7}+5 x^{6}+2$
B) $13 x^{8}-11 x^{7}+3 x^{6}+3$
C) $5 x^{42}+3$
D) $13 x^{16}-11 x^{14}+3 x^{12}+3$