Stress $\sigma$ in a material is defined by the equation $\sigma = \dfrac{F}{A}$. Strain $\varepsilon$ in the same material is defined by the equation $\varepsilon = \dfrac{x}{L}$. Which expression gives the Young modulus of the material?
- A$\dfrac{\varepsilon}{\sigma}$
- B$\dfrac{Fx}{AL}$
- C$\dfrac{\sigma x}{L}$
- D$\dfrac{F}{A\varepsilon}$