Identify the Choice That Best Completes the Statement or Answers $\text { Find } \frac { d y } { d x } \text {. }$

Multiple Choice

Identify the choice that best completes the statement or answers the question.
$\text { Find } \frac { d y } { d x } \text {. }$ $x = t ^ { 2 }$
$y = 10 - 10 t$

A) $\frac { d y } { d x } = - \frac { 20 } { t }$
B) $\frac { d y } { d x } = - \frac { 10 } { t }$
C) $\frac { d y } { d x } = - \frac { 5 } { t }$
D) $\frac { d y } { d x } = - 20 t$
E) $\frac { d y } { d x } = - \frac { t } { 10 }$