The strain-stress plot for materials A, B, C and D is shown in the figure. Which material has the largest Young's modulus?

Young's modulus, $$Y = \frac{\text{Stress}}{\text{Strain}}$$

In the given plot, strain is on the $$y$$-axis and stress is on the $$x$$-axis.

$$\text{Slope} = \frac{\text{Strain}}{\text{Stress}} = \frac{1}{Y}$$

Therefore, the material with the least slope will have the largest Young's modulus.

Observing the plot, material C has the minimum slope. Therefore, it possesses the largest Young's modulus.

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