For an ideal gas the molar heat capacity at constant volume varies as $C_V=20.0+0.010T\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$. Taking $R=8.314\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$, the enthalpy change of one mole heated from $300\mathrm{K}$ to $500\mathrm{K}$ is nearest to

1. A$4.80\mathrm{kJ}$
2. B$6.46\mathrm{kJ}$
3. C$8.96\mathrm{kJ}$
4. D$3.14\mathrm{kJ}$