Evaluate the Rational Function $$r ( x ) = \frac { x } { x ^ { 2 } - 9 x + 20 } , r ( 8 )$$

Multiple Choice

Evaluate the rational function.
- $$r ( x ) = \frac { x } { x ^ { 2 } - 9 x + 20 } , r ( 8 )$$

A) 0
B) Undefined
C) $\frac { 2 } { 3 }$
D) $- \frac { 2 } { 3 }$