Find the Greatest Common Factor of the Monomials $- 6 x ^ { 10 }$

Multiple Choice

Find the greatest common factor of the monomials.
- $- 6 x ^ { 10 }$ and $8 x ^ { 7 }$

A) $- 8 x ^ { 3 }$
B) $2 x ^ { 7 }$
C) $2 x ^ { 10 }$
D) $- 6 x ^ { 7 }$