Simplify the Following by Combining Like Terms $2 x ^ { 8 } + 8 x ^ { 8 } - 4 x ^ { 8 }$

Multiple Choice

Simplify the following by combining like terms.
- $2 x ^ { 8 } + 8 x ^ { 8 } - 4 x ^ { 8 }$

A) $6 x ^ { 24 }$
B) $- 64 x ^ { 8 }$
C) $6 x ^ { 8 }$
D) cannot be simplified