$A$ wire of Young's modulus $1.6 \times 10^{12} \,N/m^{2}$ is stretched by a force so as to produce a strain of $2 \times 10^{-4}$. The energy density of the wire is
- A$3.2 \times 10^{4} \,J/m^{3}$
- B$3.2 \times 10^{8} \,J/m^{3}$
- C$1.6 \times 10^{3} \,J/m^{3}$
- D$6.4 \times 10^{3} \,J/m^{3}$
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