Which one among the following is the correct option for right relationship between $C_P$ and $C_V$ for one mole of ideal gas?

For an ideal gas, the molar heat capacity at constant pressure ($C_P$) is always greater than the molar heat capacity at constant volume ($C_V$). The difference is equal to the gas constant $R$. This is known as Mayer's relation:
$$C_P-C_V=R$$