Simplify the Polynomial by Combining Like Terms $7 x ^ { 8 } + 9 x ^ { 6 } + 7 x ^ { 8 }$

Multiple Choice

Simplify the polynomial by combining like terms.
- $7 x ^ { 8 } + 9 x ^ { 6 } + 7 x ^ { 8 }$

A) $14 x ^ { 8 } + 9 x ^ { 6 }$
B) $23 x ^ { 22 }$
C) $23 x^ { 6 }$
D) cannot be simplified