For a constant hydraulic stress on an object, the fractional change in the object's volume $\left(\frac{∆\mathrm{V}}{\mathrm{V}}\right)$ and its bulk modulus (b) are related as

• A

  $\frac{∆\mathrm{V}}{\mathrm{V}} \propto \mathrm{B}$

• B

  $\frac{∆\mathrm{V}}{\mathrm{V}} \propto \frac{1}{\mathrm{B}}$

• C

  $\frac{∆\mathrm{V}}{\mathrm{V}}\propto {\mathrm{B}}^2$

• D

  $\frac{∆\mathrm{V}}{\mathrm{V}}\propto {\mathrm{B}}^{-2}$