Find $\lim _ { x \rightarrow 9 } \frac { x - 7 } { x ^ { 2 } + 11 x + 18 }$

Multiple Choice

Find $\lim _ { x \rightarrow 9 } \frac { x - 7 } { x ^ { 2 } + 11 x + 18 }$ by direct substitution.

A) 198
B) $\frac { 1 } { 99 }$
C) $\infty$
D) limit does not exist
E) 0