The work done in stretching an elastic wire per unit volume is 

  • A

    $Stress$ $ \times $ $Strain$

  • B

    $\frac{1}{2} \times $$Stress$ $ \times $$Strain$

  • C

    $2 \times {\rm{strain}} \times {\rm{stress}}$

  • D

    $Stress$$/$$Strain$

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