Add or Subtract as Indicated $\left(-3+2 x^{6}+7 x^{8}+8 x^{7}\right)+\left(-4 x^{7}+4 x^{6}+2+2 x^{8}\right)$

Multiple Choice

Add or subtract as indicated.
- $\left(-3+2 x^{6}+7 x^{8}+8 x^{7}\right) +\left(-4 x^{7}+4 x^{6}+2+2 x^{8}\right)$

A) $-7 x^{8}-7 x^{7}+9 x^{6}+10$
B) $9 x^{16}+4 x^{14}+6 x^{12}-1$
C) $9 x^{8}+4 x^{7}+6 x^{6}-1$
D) $19 x^{42}-1$