For the Given Functions F and G , Find the Indicated

Multiple Choice

For the given functions f and g , find the indicated composition.
- $$f ( x ) = \frac { x - 10 } { 7 } , \quad g ( x ) = 7 x + 10$$
$( g \circ f ) ( x )$

A) $x$
B) $x - \frac { 10 } { 7 }$
C) $x + 20$
D) $7 x + 60$