Simplify by Writing the Expression Without Absolute Value Bars $\frac { 15 - z } { | 15 - z | }$

Simplify by writing the expression without absolute value bars.
- $\frac { 15 - z } { | 15 - z | }$ for $z < 15$

A) $- 15$
B) 15
C) 1
D) $- 1$