If $m ( x ) = x + 4$ And $n ( x ) = \frac { 1 } { x + 9 }$

Multiple Choice

If $m ( x ) = x + 4$ and $n ( x ) = \frac { 1 } { x + 9 }$ find the function value, if possible.
$( n \circ m ) ( - 9 )$

A) $- 5$
B) $\frac { 1 } { 4 }$
C) 0
D) Undefined