Simplify the Rational Expression $$\frac { x + 12 } { x ^ { 2 } + 5 x - 84 }$$

Multiple Choice

Simplify the rational expression. If the rational expression cannot be simplified, so state.
- $$\frac { x + 12 } { x ^ { 2 } + 5 x - 84 }$$

A) $x - 7$
B) cannot be simplified
C) $\frac { 1 } { x - 7 }$
D) $\frac { 1 } { x + 7 }$