Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve.
- $\mathrm { d } = \mathrm { rt }$ for $\mathrm { r }$

A) $r = \frac { t } { d }$
B) $r = \frac { d } { t }$
C) $r = d t$
D) $\mathrm { r } = \mathrm { d } - \mathrm { t }$