For the Given Functions F and G , Find the Indicated

Multiple Choice

For the given functions f and g , find the indicated composition.
- $$f ( x ) = - 4 x + 9 , \quad g ( x ) = 5 x + 3$$
$( g f ) ( x )$

A) $- 20 x + 21$
B) $20 x + 48$
C) $- 20 x - 42$
D) $- 20 x + 48$