For the intended reversible adiabatic compression, $pv^{\gamma}$ is constant and $w_{in}=p_1v_1[(p_2/p_1)^{(\gamma-1)/\gamma}-1]/(\gamma-1)$. Substitution gives 63.3404 kJ/kg, so **D**. This is positive work input; work done by the gas has the opposite sign.
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