Factor Out the Variable That Is Raised to the Smaller $x^{-6}-7 x^{-9}$

Multiple Choice

Factor out the variable that is raised to the smaller exponent
- $x^{-6}-7 x^{-9}$

A) $x^{-9}\left(7 x^{3}\right)$
B) $x^{-9}\left(x^{3}-7\right)$
C) $x^{-9}\left(x^{3}+7\right)$
D) $x^{-9}\left(x^{-3}-7\right)$