Collect Like Terms and Then Arrange in Descending Order $4 x^{4}+3 x^{6}-7 x+9 x^{6}+2 x-8 x^{4}$

Multiple Choice

Collect like terms and then arrange in descending order.
- $4 x^{4}+3 x^{6}-7 x+9 x^{6}+2 x-8 x^{4}$

A) $3 x^{11}$
B) $12 x^{6}-4 x^{4}-5 x$
C) $12 x-4 x^{6}-5 x^{4}$
D) $5 x^{6}+13 x^{4}-15 x$