Discussion
The Young's modulus of the composite is
Answer: D
The Young's modulus is \(2.77 \times 10^{4}\) kg/cm2.
Since the curve is linear up to the break, the modulus is the breaking stress over the breaking strain:
\[ \begin{aligned} \varepsilon &= \frac{0.03}{4} = 0.0075 \\ E &= \frac{208.3}{0.0075} = 2.78 \times 10^{4}\ \text{kg/cm}^{2} \end{aligned} \]
which is the key's \(2.77 \times 10^{4}\) within rounding. The lower options would require a larger strain or a smaller stress than the data give.
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