Translate the Stated Rule or Relationship to a Formula $d$ , Is Equal to the Speed

Translate the stated rule or relationship to a formula.
-The distance traveled, $d$ , is equal to the speed, $r$ , multiplied by the time traveled, $t$ .

A) $\mathrm{d}=\mathrm{rt}$
B) $\mathrm{d}=\mathrm{r}+\mathrm{t}$
C) $d=r / t$
D) $t=d r$