Find the Requested Composition of Functions $f ( x ) = \frac { 5 } { x - 8 }$

Multiple Choice

Find the requested composition of functions.
-Given $f ( x ) = \frac { 5 } { x - 8 }$ and $g ( x ) = \frac { 4 } { 5 x }$ , find $( f \circ g ) ( x )$

A) $\frac { 4 x - 32 } { 25 x }$
B) $\frac { 25 x } { 4 + 40 x }$
C) $\frac { 5 x } { 4 - 40 x }$
D) $\frac { 25 x } { 4 - 40 x }$