Simplify and Write with Positive Exponents Only $9 - 1 + 8 ^ { - 1 }$

Simplify and write with positive exponents only.
- $9 - 1 + 8 ^ { - 1 }$

A) $\frac { 17 } { 72 }$
B) $\frac { 72 } { 17 }$
C) 2
D) 1