Find a Formula for the Slope of the Graph Of f

Multiple Choice

Find a formula for the slope of the graph of $f$ at the point $( x , f ( x ) )$ .Then use it to find the slope at the given point. $f ( x ) = \frac { 1 } { x + 4 } , \quad ( - 3,1 )$

A) $\begin{array} { l } m = \frac { 1 } { ( x + 4 ) ^ { 2 } } \\\text { At } ( - 3,1 ) , m = 1\end{array}$
B) $\begin{array} { l } m = - \frac { 1 } { ( x + 4 ) ^ { 2 } } \\\text { At } ( - 3,1 ) , m = 1\end{array}$
C) $\begin{array} { l } m = \frac { 1 } { ( x + 4 ) ^ { 2 } } \\\text { At } ( - 3,1 ) , m = - 1\end{array}$
D) $\begin{array} { l } m = - \frac { 1 } { ( x + 4 ) } \\\text { At } ( - 3,1 ) , m = - 1\end{array}$
E) $\begin{array} { l } m = - \frac { 1 } { ( x + 4 ) ^ { 2 } } \\\text { At } ( - 3,1 ) , m = - 1\end{array}$