A student is asked to measure $30.0 {\text{g}}$ of methanol $(d=0.7914 \text{g/mL at 25}^{\circ}\text{C})$ but has only a graduated cylinder with which to measure it. What volume of methanol should the student use to obtain the required ${30.0 \text{g}}$?

${ \textbf{(A)}\ 23.7 \text{mL} \qquad\textbf{(B)}\ 30.0 \text{mL} \qquad\textbf{(C)}\ 32.4 \text{mL} \qquad\textbf{(D)}\ 37.9 \text{mL} }$
1. Let the density be $\rho$, the mass be $m$, and the volume be $V$. The relationship between these quantities is given by the formula for density:
   \[
   \rho = \frac{m}{V}
   \]
2. We need to solve for the volume $V$. Rearrange the formula to solve for $V$:
   \[
   V = \frac{m}{\rho}
   \]
3. Substitute the given values into the equation. The mass $m$ is $30.0 \, \text{g}$ and the density $\rho$ is $0.7914 \, \text{g/mL}$:
   \[
   V = \frac{30.0 \, \text{g}}{0.7914 \, \text{g/mL}}
   \]
4. Perform the division to find the volume:
   \[
   V = \frac{30.0}{0.7914} \approx 37.9 \, \text{mL}
   \]

Conclusion:
\[
\boxed{37.9 \, \text{mL}}
\]