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Explanation

Young's modulus is the slope of the stress-strain curve in the elastic region. It can be determined from Hooke's law:

$$\sigma =\epsilon E$$

From the graph below we have $\sigma =80\mathrm{MPa}$ for a strain of 2%, which gives:

$$E=\frac{80\mathrm{MPa}}{0.02}=4\mathrm{GPa}$$