To determine the correct units for \( t \) in the equation \( d = rt \), we start with the units given in the problem.
- The distance \( d \) is in meters (m).
- The rate \( r \) is in meters per minute (m/min).
Now, we can rearrange the formula to solve for \( t \):
\[ t = \frac{d}{r} \]
Substituting the units we have:
\[ t = \frac{\text{meters}}{\text{meters per minute}} = \frac{m}{m/min} \]
When you divide meters by meters per minute, the meters cancel out, and you multiply by the reciprocal of the denominator:
\[ t = \frac{m \cdot \text{min}}{m} = \text{min} \]
Thus, the units of \( t \) must be minutes.
The correct answer is:
D. minutes