Find the Indicated Derivative $\frac { \mathrm { dt } } { \mathrm { dx } }$

Multiple Choice

Find the indicated derivative.
- $\frac { \mathrm { dt } } { \mathrm { dx } }$ if $\mathrm { t } = \frac { \mathrm { x } } { 8 \mathrm { x } - 2 }$

A) $- \frac { 2 } { ( 8 x - 2 ) ^ { 2 } }$
B) $\frac { 16 x - 2 } { ( 8 x - 2 ) ^ { 2 } }$
C) $- \frac { 2 x } { ( 8 x - 2 ) ^ { 2 } }$
D) $- \frac { 2 } { 8 x - 2 }$