$P-V$ diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be
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Statement $I :$ In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.
Statement $II :$ In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.
In the light of the above statements, choose the correct answer from the options given below: