A metal cube with side $l$ is held in a vice and undergoes elastic compression due to two opposing forces $F$. What is the relationship between $\Delta l$, the amount of compression, and $l$?
- A$\Delta l \propto \frac{1}{l^2}$
- B$\Delta l \propto \frac{1}{l}$
- C$\Delta l \propto l$
- D$\Delta l \propto l^2$